JP5106282B2 - Panel mounting bracket, radio wave absorbing wall, radio wave absorbing panel mounting method, and radio wave absorbing wall construction method - Google Patents

Description

  The present invention particularly relates to a panel mounting bracket for mounting a radio wave absorption panel for absorbing unwanted radio waves to a housing, a radio wave absorption wall including a plurality of radio wave absorption panels mounted by the panel mounting bracket, and a radio wave absorption panel. The present invention relates to a method for mounting a radio wave absorption panel that is attached to a housing using a panel mounting bracket, and a method for constructing a radio wave absorbing wall using the panel mounting bracket.

  Nonstop toll booths and free-flow ETC are based on the development of ETC (Electronic Toll Collection) using DSRC (Dedicated Short Range Communications) which is one of ITS (Intelligent Transport Systems). Widely popular.

Around the antenna equipment used in this non-stop toll booth and free-flow ETC, a radio wave absorption panel is installed in the housing (structure) to prevent system malfunction caused by radio wave multiple reflection in road structures. There are many. In other words, DSRC uses 5.8 GHz radio waves, but in order to reduce the malfunction of equipment due to unnecessary radio waves caused by the irregular reflection of these radio waves, there are a large number of radio waves that absorb unnecessary radio waves around the system. An electromagnetic wave absorber (wall, ceiling, canopy) consisting of an absorption panel is installed. Radio wave absorption panels are most commonly used in the lower part of the canopy at nonstop tollgates. For this part, for example, foamed polyethylene to which carbon is added, or an organic fibrous radio wave absorber is used.
In addition, when there are a plurality of ETC lanes, a radio wave absorption panel may be provided on the partition wall, and in that case, visibility is required to ensure safety. Is known as Patent Document 1.

  Patent Document 1 exemplifies a radio wave absorption panel made of polycarbonate. For installation on a housing, a bolt hole is formed in the radio wave absorption panel and fixed to the housing with a bolt, or a frame material such as metal or FRP is used. There is a construction method in which a panel is formed and this is dropped into an H steel column or case. Further, Patent Document 2 discloses an example in which a radio wave absorption panel with a bolt hole is fixed to a housing with a bolt.

In this way, when the resin wave absorbing panel is fixed to the housing with bolts, there is concern about the deterioration of the resistance film due to the ingress of moisture from the bolt holes and the problem of delamination between the polycarbonate and the resistance film. Patent Document 3 discloses disposing a sealing material.
“Development of transparent electromagnetic wave absorption panel for ETC” Mitsubishi Electric Industrial Times Inc. No. 101 P51 JP 2002-146964 A, JP 2003-289220 A

  However, foam-based and organic fiber-based wave absorbers are often placed in a case for the purpose of maintaining their durability, and a mounting mechanism is provided on the case, but the use of the case leads to an increase in cost. was there. The construction method of dropping the radio wave absorption panel into the case and the construction method of dropping the radio wave absorption panel into the H steel column are, for example, when the radio wave absorption panel constructed at the bottom is damaged, Since it had to be taken out from the upper part of a steel support | pillar, there existed a problem that replacement work of the broken electromagnetic wave absorption panel took time.

  In addition, in the case of the bolt fixing type in the resin wave absorption panel made of resin, there is a problem such as deterioration of the resistance film due to water intrusion from the bolt hole, so it is necessary to install a sealing material in the bolt hole. There was a drawback that it took time and effort. Further, there is a concern about loosening of the bolt, and in this case, the radio wave absorption panel may fall off the casing.

  On the other hand, a glass radio wave absorption panel has been proposed. Unlike glass and foam-based absorbers, glass-made radio wave absorption panels have high rigidity and high durability, so even if you do not put the radio wave absorption panel in a case or attach protective material to the front Is available. In addition, it has excellent performance in terms of durability, scratch resistance and the like as compared with a polycarbonate absorbent body having high rigidity.

  However, with respect to glass radio wave absorption panels, it is difficult to drill holes. When drilling holes, force is applied to the part after installation, and high glass strength is required around the holes, so tempered glass must be used. Therefore, it is difficult to adopt the construction method using the bolt disclosed in Patent Document 2 because it leads to cost increase. In addition, as described above, a construction method in which a glass radio wave absorption panel is dropped on the H steel column is also conceivable, but in this construction method, the damaged radio wave absorption panel is replaced regardless of whether the radio wave absorption panel is made of glass or resin. The work takes time and the metal surface of the H-steel strut is continuously exposed in the height direction of the radio wave absorption wall on the radio wave arrival surface side of the radio wave absorption wall. There was also a problem that construction could not be performed without impairing performance.

  In this way, especially in the case of glass-made radio wave absorption panels, compared to the construction method for easily attaching the radio wave absorption panel to the housing, and the construction method for dropping unnecessary radio wave absorption performance into the conventional H steel column. The construction method to raise was not found.

  The present invention has been made in view of such circumstances, and can easily attach a glass radio wave absorption panel to a housing, as compared with a construction method in which a radio wave absorption panel is dropped on a conventional H steel column. An object of the present invention is to provide a panel mounting bracket, a radio wave absorbing wall, a radio wave absorbing panel mounting method, and a radio wave absorbing wall construction method capable of increasing the absorption rate of unnecessary radio waves.

  In order to achieve the above-mentioned object, the panel mounting bracket of the present invention is a panel mounting bracket for vertically mounting a plurality of glass radio wave absorption panels adjacent to each other in a substantially horizontal direction and mounting the panel to a housing. Two U-shaped grooves that support the lower corners or the upper corners of different radio wave absorption panels at adjacent portions of the radio wave absorption panel adjacent to each other in the direction, three side plates whose surfaces are juxtaposed in the vertical direction, and the side plates A continuous portion composed of two support plates provided in the horizontal direction between the two side plates, and 2 open in the length direction of one U-shaped groove of the continuous portion. A closing member that closes one of the two side surfaces and a side surface opposite to the side surface where the closing member is located, of the two side surfaces opened in the length direction of the other U-shaped groove of the connecting portion The radio wave absorption panel is provided in the continuous portion. A cover plate attached to After lifting, is characterized by comprising a.

  According to the present invention, the radio wave absorption panel is constructed by supporting only the corners of the glass radio wave absorption panel on the panel mounting bracket fixed to the housing. This panel mounting bracket has a continuous portion in which two U-shaped grooves are continuously provided, and the corner of the radio wave absorbing panel is supported by the U-shaped groove to attach the radio wave absorbing panel to the housing. .

  As described above, according to the panel mounting bracket of the present invention, a continuous portion composed of a pair of U-shaped grooves that support the corners of the radio wave absorption panel, a blocking member that restrains the position in the substantially in-plane direction of the radio wave absorption panel, And the cover plate that prevents the radio wave absorption panel from falling off, the glass radio wave absorption panel can be easily attached to the housing. Moreover, a pair of U-shaped groove | channels provided in a row by the continuous installation part supports two lower corners or upper corners which differ in the adjacent part of the said electromagnetic wave absorption panel adjacent to a substantially horizontal direction. The U-shaped groove is composed of three side plates whose surfaces are juxtaposed in the vertical direction and two support plates provided in the horizontal direction between the two side plates. Only the surface forming one U-shaped groove among the surfaces forming the pair of U-shaped grooves is exposed on the radio wave arrival surface side of the wall. And since the exposed surface is exposed only at the corners of the radio wave absorption panel, the area of the reflection surface of the unnecessary radio wave is greatly reduced as compared with the support form of the radio wave absorption panel by the H steel support. Therefore, according to the panel mounting bracket of the present invention, the absorption rate of unnecessary radio waves can be significantly increased as compared with a construction method in which a radio wave absorption panel is dropped on a conventional H steel column.

  In the panel mounting bracket of the present invention, it is preferable that the U-shaped groove of the continuous portion is paired symmetrically with respect to the bottom of the U-shaped groove. As a result, a single panel mounting bracket can support up to four corners of the radio wave absorption panel adjacent to the top, bottom, left and right, so the number of panel mounting brackets used when constructing the radio wave absorption wall can be reduced. It can be greatly reduced.

  Furthermore, the panel mounting bracket of the present invention is a panel mounting bracket for vertically mounting a plurality of glass radio wave absorption panels adjacent to each other in a substantially horizontal direction and a substantially vertical direction, and mounting the frame to the housing. In the adjacent part of the four radio wave absorption panels adjacent to each other in the substantially vertical direction, the two lower corners and the two upper corners respectively supporting the two lower corners and the two upper corners of the different radio wave absorption panels are opened. A total of four U-shaped grooves, two of which are provided in the horizontal direction between the three side plates whose surfaces are juxtaposed in the vertical direction and between the two side plates and not at the ends. A blocking member configured to block one of the two side surfaces opened in the length direction of the two U-shaped grooves that are paired above and below the connecting portion; The length direction of two U-shaped grooves of the other pair of the connecting portions A cover plate that is detachably provided on the side surface opposite to the side surface side where the blocking member is located, and is attached after the radio wave absorption panel is supported by the connecting portion. It is preferable to do.

  According to the panel mounting bracket of the present invention, a continuous portion composed of four U-shaped grooves that support the corners of the four radio wave absorption panels, a blocking member that restrains the position of the radio wave absorption panel in a substantially in-plane direction, And the cover plate that prevents the radio wave absorption panel from falling off, the glass radio wave absorption panel can be easily attached to the housing. Further, the U-shaped groove continuously provided in the continuous portion includes two lower corner portions and two upper corner portions of the different radio wave absorption panels in adjacent portions of the radio wave absorption panel adjacent in the substantially horizontal direction and the substantially vertical direction. A total of four U-shaped grooves for supporting each of them are provided in the horizontal direction between the three side plates whose surfaces are juxtaposed in the vertical direction and between the two side plates and not at the end portions. Since it is composed of a single support plate, only the surface that forms the two U-shaped grooves out of the surfaces that form the four U-shaped grooves is exposed to the radio wave arrival surface side of the radio wave absorbing wall. . And since the exposed surface is exposed only at the corners of the radio wave absorption panel, the area of the reflection surface of the unnecessary radio wave is greatly reduced as compared with the support form of the radio wave absorption panel by the H steel support. Therefore, according to the panel mounting bracket of the present invention, the absorption rate of unnecessary radio waves can be significantly increased as compared with a construction method in which a radio wave absorption panel is dropped on a conventional H steel column. In addition, a single panel mounting bracket can support up to four corners of the radio wave absorption panel adjacent to the top, bottom, left and right, greatly increasing the number of panel mounting brackets used when constructing the radio wave absorption wall. Can be reduced.

  Furthermore, the panel mounting bracket of the present invention is a surface of the panel mounting bracket, and the length of the vertical side and the horizontal side of the surface on which the radio wave arrives is 30 mm or more, respectively, and the two or less wavelengths of the incoming radio wave. Preferably there is. If the length of one side of the surface is two wavelengths or less of the incoming radio wave, reflection of unnecessary radio waves by the surface can be suppressed to be small. Further, the length of one side of 30 mm or more is required from the swallowing depth for supporting the radio wave absorption panel on the panel mounting bracket.

  In the panel mounting bracket of the present invention, it is preferable that a groove for inserting the cover plate in the vertical direction is formed. Accordingly, by sequentially inserting the cover plate into the groove from the upper part toward the lower part over the entire length of the plurality of radio wave absorption panels arranged in the vertical direction, a plurality of the radio wave absorption panels arranged in the vertical direction are arranged. One cover plate or a plurality of divided cover plates are attached to the panel mounting bracket. Thus, by forming the groove for inserting the cover plate in the vertical direction in the panel mounting bracket, the cover plate can be easily attached to the plurality of panel mounting brackets arranged in the vertical direction.

  The radio wave absorption wall of the present invention is a radio wave absorption wall composed of a plurality of the radio wave absorption panels which are configured in a substantially rectangular shape by the panel mounting bracket of the present invention and are attached to a housing, and the panel mounting bracket is The corners of one of the left and right sides of each panel of the plurality of the radio wave absorption panels are fixed to the casing in positions that support the corners of the absorption panel and in the same direction. The U-shaped groove with the closing member is supported among the continuous portions of the panel mounting bracket at the position where the portion is supported, and the corner of the other side of the left and right sides supports the corner of the other side The U-shaped groove with the cover plate is supported among the continuous portions of the panel mounting brackets at different positions, and the cover plate extends over the entire length of the radio wave absorption panel continuously provided in the vertical direction. Remove the cover plate It is characterized in that mounted in succession on one side that is open in U-shaped grooves in the connecting portion towards put.

  According to the radio wave absorption wall of the present invention, since it is constructed by attaching the radio wave absorption panel using the panel mounting bracket of the present invention, the construction of the radio wave absorption wall is facilitated, and the conventional H steel column is attached. Compared with construction methods that drop radio wave absorption panels, the absorption rate of unwanted radio waves can be greatly increased.

  In the radio wave absorbing wall of the present invention, the radio wave absorbing panel may be fixed so that an inclination angle of the radio wave absorbing panel with respect to a surface formed by the housing is 1 to 10 degrees toward a radio wave arrival direction. preferable. Accordingly, since the radio wave absorption panel can be easily attached to the mounting hardware, problems such as workability of the radio wave absorption wall, the size of the mounting bracket, and the fit of the radio wave absorption panel are reduced. In addition, this configuration can prevent incoming radio waves from directly reaching the cover plate of the connecting portion and reflecting it.

  In the radio wave absorption wall of the present invention, it is preferable that the radio wave absorption panels adjacent in the vertical direction are fixed to the panel mounting bracket with an interval of 10 mm or more and 1 wavelength or less of the incoming radio wave. This is because if the interval between the upper and lower adjacent radio wave absorption panels is less than 10 mm, the construction of the radio wave absorption panel becomes difficult, and if it exceeds one wavelength of the incoming radio wave, the radio wave is likely to be transmitted.

  In the radio wave absorbing wall of the present invention, it is preferable that the radio wave absorbing panel fall prevention wire connected to the radio wave absorbing panel is attached to the panel mounting bracket. By connecting the radio wave absorption panel to the panel mounting bracket via the fall prevention wire in this way, the radio wave absorption panel is prevented from falling off the radio wave absorption wall when the radio wave absorption panel is dropped from the panel mounting bracket. be able to. The number, connection position, and length of the drop-off prevention wires are appropriate, but it is more preferable that the radio wave absorption panel dropped from the panel mounting bracket is set so as not to fall on the road surface.

  In the radio wave absorbing wall of the present invention, it is preferable that the cover plate is divided in the length direction. By dividing the cover plate in the length direction in this way, for example, when replacing the uppermost radio wave absorption panel, it is only necessary to remove the cover plate located at the upper part from the panel mounting bracket, so it is not divided. Compared to the case of a single cover plate, the radio wave absorption panel can be easily replaced.

  According to the mounting method of the radio wave absorption panel of the present invention, the panel mounting bracket of the present invention is used, and the corner of one side of the left and right sides of the radio wave absorption panel is positioned at the position where the corner is supported. Another panel at a position where the corner of the other side of the left and right sides supports the corner of the other side is inserted through a U-shaped groove to which the cover plate is to be attached. Tilt toward the U-shaped groove with the closing member among the continuous portions of the mounting bracket, insert the U-shaped groove with the closing member, and insert the cover plate with the cover plate. It is characterized in that it is attached to one side surface where the U-shaped groove of the continuous portion to be attached is opened, and the corner of the radio wave absorbing panel is fixed to the panel mounting bracket.

  That is, according to the method for attaching the radio wave absorption panel of the present invention, the corners of one of the left and right sides of the radio wave absorption panel are inserted through the U-shaped groove to which the cover plate is attached, and then the radio wave absorption is performed. The corner of the other side of the left and right sides of the panel is inserted into the U-shaped groove on the side where the blocking member is present, and the radio wave absorbing panel is supported by the panel mounting bracket. Thereafter, the cover plate is attached to one side surface where the U-shaped groove of the continuous portion is opened, and the corner of the radio wave absorption panel is fixed to the panel mounting bracket. This fixing method is preferably performed using a watertight member such as a setting block, a gasket, and a wet seal material instead of a bolt. Also, when replacing an existing radio wave absorption panel, remove the cover plate from the panel mounting bracket, and move the radio wave absorption panel in the reverse procedure of the installation procedure described above, so that the radio wave absorption panel to be replaced is It can be easily removed from the mounting bracket.

  According to the construction method of the radio wave absorbing wall of the present invention, using the panel mounting bracket of the present invention, the panel mounting bracket is a position that supports the corner of the radio wave absorbing panel, and the closing member is in the same direction, A U-shape that is fixed to the housing and that attaches the cover plate to the corner of one of the left and right sides of the radio wave absorption panel, among the connecting portions of the panel mounting bracket at a position that supports the corner. U of the other side of the left and right sides of the other side of the panel mounting bracket in a position to support the corner of the other side is inserted through the groove. The cover plate is tilted toward the letter-shaped groove and inserted into the U-shaped groove having the blocking portion, and the cover plate is extended over the entire length of the radio wave absorption panel continuously provided in the vertical direction. The U-shaped groove of the connecting part of the person attaching the Mounting continuously on one side it is, is characterized by constituting the radio wave absorbing wall consisting of the wave absorber panel.

  According to the construction method of the radio wave absorbing wall of the present invention, first, the panel mounting bracket is fixed to the housing so as to support the corners of the radio wave absorbing panel and so that the closing member is in the same direction. After that, the radio wave absorption panel is supported by the panel mounting bracket in accordance with the radio wave absorption panel installation method, the cover plate is attached, and the radio wave absorption wall is constructed.

  According to the construction method of the radio wave absorbing wall of the present invention, the cover plate is divided in the length direction, and the cover plate is inserted in order from the cover plate attached to the lowermost continuous portion of the divided cover plates. It is preferable to do. Thus, for example, when the uppermost radio wave absorption panel is replaced, only the cover plate located at the upper part may be removed from the panel mounting bracket. Therefore, it is easier to replace the radio wave absorption panel than in the case of a single cover plate that is not divided.

  According to the construction method of the radio wave absorbing wall of the present invention, it is preferable that the panel mounting bracket is fixed to a long bracket mounting member and is fixed to the casing via the bracket mounting member. As a form of mounting the panel mounting bracket to the casing, the panel mounting bracket may be directly fixed to the casing by welding or the like, but the panel mounting bracket is fixed in advance to the bracket mounting member, and this is used for the construction of the radio wave absorption wall. At this time, it may be fixed to the housing. Rather than the construction method of fixing the panel mounting brackets one by one to the chassis at the site, it is only necessary to fix only the bracket mounting members to the chassis at the site by fixing them to the bracket mounting members at the panel mounting bracket manufacturing factory. Therefore, construction workability on site is improved.

  As described above, according to the present invention, an electromagnetic wave absorption panel made of glass can be easily attached to the housing, and the absorption rate of unnecessary radio waves is reduced compared to a construction method in which the electromagnetic wave absorption panel is dropped on a conventional H steel column. A panel mounting bracket that can be raised can be provided, a radio wave absorbing wall that is easy to construct using this panel mounting bracket, and a radio wave absorbing panel mounting method that is easy to construct using this panel mounting bracket, And the construction method of the electromagnetic wave absorption wall which is easy to construct using this panel attachment metal fitting can be provided.

  A preferred embodiment will be described below by taking ETC as an example of a panel mounting bracket, a radio wave absorbing wall, a radio wave absorbing panel mounting method, and a radio wave absorbing wall construction method according to the present invention, according to the attached drawings.

FIG. 1 is a cross-sectional view of a glass radio wave absorption panel 10 according to an embodiment. Also,
FIG. 2 shows an outline of a free flow ETC as an example of an ETC facility, and a radio wave absorption wall 14 including a plurality of radio wave absorption panels 10, 10... . The ETC facility in which the radio wave absorption panel 10 is installed is not limited to the roadside antenna 12, but can be installed in an ETC facility such as a transparent partition wall of a toll gate island.

  The radio wave absorption panel 10 is a laminated glass formed by sandwiching an intermediate film 16 which is a resin sheet made of PVB or EVA as shown in FIG. 1 between two non-reinforced glass plates 18 and 20. Here, the glass plate 18 is a glass plate on the radio wave incident side, and a conductive film 22 having a predetermined resistance value is formed on the contact surface of the glass plate 18 with the intermediate film 16, so that the glass plate 20 is in contact with the intermediate film 16. A conductive film 24 having a predetermined resistance value is formed on the surface.

  The sheet resistance value of the conductive film 22 is set to be larger than the sheet resistance value of the conductive film 24, and radio waves to be absorbed are transmitted through the conductive film 22, reflected by the conductive film 24, and canceled by the reflected radio waves. It is configured as follows.

These conductive films 22 and 24 are transparent and are films mainly composed of one or more metal oxides selected from the group consisting of Sn, In, and Zn. For example, F-doped SnO ₂ (here, (Also referred to as tin oxide), antimony-doped SnO ₂ , Sn-doped In ₂ O ₃ (ITO), aluminum-doped ZnO, gallium-doped ZnO, and the like. In the embodiment, transparent tin oxide (SnO ₂ ) is coated on the glass surface by a CVD method.

  In the method for manufacturing the radio wave absorption panel 10, the intermediate film 16 is sandwiched between two glass plates 18 and 20 coated with tin oxide conductive films 22 and 24 by a CVD method, and this is heated to a predetermined temperature by an autoclave. At the same time, it is manufactured by pressing at a predetermined pressure. This manufacturing method is basically the same as the manufacturing method of laminated glass.

  As the intermediate film 16 which is a resin sheet, PVB, EVA film or the like used for laminated glass for construction is used. When the glass edge is exposed, it is suitable to use an EVA film with little influence of water.

  3 is a front view of the radio wave absorption wall 14 viewed from the direction of radio wave arrival, FIG. 4 is a plan view of the radio wave absorption wall 14 when the radio wave absorption wall 14 of FIG. 3 is viewed from the line AA, and FIG. 5 is an enlarged cross-sectional view of a main part of the plan view shown in FIG. 3 illustrates the radio wave absorption wall 14 including the radio wave absorption panels 10, 10... In three rows and six rows. However, the size of the radio wave absorption wall 14 is not limited to this form.

  As shown in FIGS. 4 and 5, the radio wave absorbing panels 10, 10 are supported at the corners by the panel mounting brackets 28, 28. 26 ... are attached. These panel mounting brackets 28, 28 ... are directly fixed to the H steel columns 26, 26 ... by welding or bolts. As will be described later, the mounting bracket may be fixed to the housing via another member to which the mounting bracket is attached.

  The panel mounting bracket 28 shown in FIGS. 5 and 6 is ten panel mounting brackets fixed to the inside of the wall of the radio wave absorbing wall 14. Moreover, the panel mounting bracket fixed to the four corners of the radio wave absorbing wall 14 is the panel mounting bracket 30 shown in FIG. Further, the panel mounting bracket fixed to the upper side of the radio wave absorbing wall 14 except the upper corner is the panel mounting bracket 32 shown in FIG. Furthermore, the panel mounting bracket fixed to the lower side of the radio wave absorbing wall 14 excluding the lower corner is a panel mounting bracket 34 shown in FIG. Further, the panel mounting bracket fixed to the left and right side portions excluding the four corners of the radio wave absorbing wall 14 is the panel mounting bracket 36 shown in FIG.

  Here, the configuration of the panel mounting bracket 28 of FIGS. 5 and 6 in which the features of the present invention are embodied will be described. The configuration of the panel mounting brackets 30, 32, 34, and 36 shown in FIGS. 7 to 10 will be described later. In the text, the same reference numerals are given to portions having the same or similar functions as the panel mounting bracket 28. To explain.

  As shown in FIG. 6, the panel mounting bracket 28 includes a continuous portion 38, a closing member 40, and a cover plate 42 (see FIG. 5).

  The connecting portion 38 has a total of four U-shaped grooves, two U-shaped grooves 44 and 46 opened upward and two U-shaped grooves 44 and 46 opened downward in the vertical direction. The two side plates 50, 50A, 54 and the two support plates provided horizontally between the two side plates (between 50 and 50A and 50A and 54), respectively. 48 and 52.

  The U-shaped groove 44 opened upward is formed from the support plate 48 that is the bottom of the U-shaped groove, the side plate 50 that is one of the U-shaped rising portions, and the side plate 50A that is the other of the U-shaped rising portions. Of the two side surfaces opened in the length direction of the U-shaped groove (substantially in-plane direction of the radio wave absorption panel), one is closed by the closing member 40 and the other is opened as it is. Similarly, the upwardly opened U-shaped groove 46 connected to the upwardly opened U-shaped groove 44 is one of the support plate 52 that is the bottom of the U-shape and the U-shaped rising portion. One of the two side surfaces, which is composed of the side plate 54 and the side plate 50A which is the other of the U-shaped rising portions, is open in the length direction of the U-shaped groove (the substantially in-plane direction of the radio wave absorption panel). A plate 42 (not shown in FIG. 6) is attached to and detached from the side of the U-shaped groove 44 opposite to the side where the closing member 40 is located, and the other U-shaped groove 44 is open. The opposite side is open as it is.

  The U-shaped grooves 44 and 46 opened downward have the same configuration as the U-shaped grooves 44 and 46 opened upward. However, when the two radio wave absorption panels are adjacent to each other in the substantially horizontal direction, the support plates 48 and 52 may be positioned horizontally at one of the end portions of the side plates 50, 50A, and 54 ( 8 and 9). In FIG. 8, this support plate is represented by a support plate 47 that is located at an end portion of the two support plates. In FIG. 9, the support plates 48 and 52 are used. However, as in FIG. 8, two support plates may be integrated and positioned at the end.

  On the other hand, when the four radio wave absorption panels are adjacent to each other in the substantially horizontal direction and the substantially vertical direction, the supports 48 and 52 are respectively positioned at positions other than the end portions of the side plates 50, 50A, and 54 as shown in FIG. Position horizontally. In this case, the U-shaped grooves 44 and 46 opened upward and the U-shaped grooves 44 and 46 opened downward are symmetrical with respect to the bottom of the U-shaped groove, that is, are formed in pairs in the vertical direction. It is preferable. The panel mounting bracket 28 of the embodiment has the U-shaped grooves 44 and 46 formed integrally in a vertically symmetrical manner, but may have a structure in which they are separated separately in the vertical direction. However, when the U-shaped grooves 44 and 46 are formed vertically and symmetrically in pairs, a maximum of four corners of the radio wave absorption panels 10 and 10 adjacent in the vertical and horizontal directions can be supported by one panel mounting bracket 28. Therefore, there is an advantage that the number of panel mounting brackets 28 used when constructing the radio wave absorbing wall 14 can be greatly reduced.

  Guide grooves 56 and 56 for inserting the cover plate 42 from above and below are formed on the opposing surfaces of the side plate 50 </ b> A and the side plate 54. That is, the cover plate 42 is detachably attached to the open side surface of the U-shaped groove 46 without the closing member 40 among the U-shaped grooves 44 and 46 of the connecting portion 38. The cover plate 42 is attached after the radio wave absorption panel 10 is supported by the U-shaped grooves 44 and 46 of the continuous portion 38.

  Next, a method of attaching the radio wave absorption panel 10 to the panel mounting brackets 28, 28 fixed to the H steel columns 26, 26 will be described with reference to FIG. Note that the panel mounting brackets 28 to 36 are fixed in advance to the H steel column 26 so as to support the corners of the radio wave absorption panel 10 and so that the closing member 40 is in the same direction (overlapping direction) in the vertical direction. Yes.

  First, as shown in FIG. 11 (A), the corner 10A on the right side of the radio wave absorption panel 10 is attached to the U on which the cover plate 42 is attached among the connected portions of the right panel mounting bracket 28 that supports the corner 10A. It is inserted through the groove 46.

  Next, the corner 10B on the left side of the radio wave absorption panel 10 is tilted toward the U-shaped groove 44 with the closing member 40 in the continuous portion of the left panel mounting bracket 28 that supports the corner 10B. This corner 10B is inserted into a U-shaped groove 44 with a closing member 40 as shown in FIG. Thus, both corners 10A and 10B of the radio wave absorption panel 10 are supported by the left and right panel mounting brackets 28 and 28.

  Next, as shown in FIG. 11C, the cover plate 42 is attached to the open side surface of the U-shaped groove 46 of the right panel mounting bracket 28 to prevent the radio wave absorption panel 10 from falling off from the panel mounting brackets 28 and 28. . Through the above operation, the radio wave absorption panel 10 is supported by the panel mounting brackets 28 and 28 and attached to the H steel columns 26 and 26.

  In this way, by attaching a plurality of radio wave absorption panels 10, 10... According to the above operation procedure, the radio wave absorption wall 14 is easily constructed as compared with a construction method in which the radio wave absorption panels are bolted one by one. be able to. Note that such attachment of the radio wave absorption panel 10 is performed on the four panel mounting brackets 28, 28... Disposed at the four corners of the radio wave absorption panel 10.

  On the other hand, when replacing the existing radio wave absorption panel 10, the cover plate 42 is removed from the panel mounting bracket 28, and the radio wave absorption panel 10 is moved in the reverse procedure to the installation procedure described with reference to FIG. The radio wave absorption panel 10 can be easily detached from the panel mounting brackets 28 and 28.

  By the way, as shown in FIG. 12, the cover plate 42 is inserted over the entire length downward from the guide grooves 56, 56 formed in the panel mounting bracket 32 fixed to the uppermost portion of the H steel column 26. Accordingly, the cover plate 42 is sequentially inserted along the guide grooves 56, 56 of the panel mounting brackets 28, 28... Positioned below the panel mounting bracket 32, and the U-shape of each panel mounting bracket 28, 28. The open side surface of the groove 46 is closed. The cover plate 42 is inserted into the guide grooves 56 and 56 formed in the U-shaped groove 46 of the panel mounting bracket 34 of FIG. Of the U-shaped groove 46 abuts against the support plate 52 of the U-shaped groove 46. Thereby, the insertion operation of the cover plate 42 is completed.

  It should be noted that the cover plate 42 is bolted using at least one of the panel mounting brackets 28, 32, 34 so that the cover plate 42 does not easily fall off the panel mounting brackets 28, 32, 34. , 34 may be fixed. Further, it is preferable that an opening 42A is formed at a predetermined position of the cover plate 42 as shown in FIG. 12, and an attaching / detaching jig is inserted into the opening 42A to detach the cover plate 42 from the panel mounting bracket. . The means for attaching and detaching the cover plate 42 is not limited to the opening 42A. For example, a handle may be attached to a predetermined position of the cover plate 42.

  As described above, according to the panel mounting bracket 28 of the embodiment, the connecting portion 38 including the pair of U-shaped grooves 44 and 46 that support the corners of the radio wave absorption panel 10, the surface of the radio wave absorption panel 10. Since it is comprised from the closure member 40 which restrains the position of an inner direction, and the cover plate 42 which prevents dropping of the electromagnetic wave absorption panel 10, the glass-made electromagnetic wave absorption panel 10 can be easily attached to the H steel support | pillar 26. .

  In addition, the pair of U-shaped grooves 44 and 46 that are continuously provided in the continuous portion 38 include three side plates 50, 50 </ b> A, and 54 that are arranged side by side in the vertical direction. Since it is composed of two support plates 48 and 52 provided in the horizontal direction between the sheets (between 50 and 50A and between 50A and 54), the radio wave of the radio wave absorbing wall 14 Only the surface of the side plate 54 that forms the U-shaped groove 46 is exposed on the arrival surface side. And since the surface of the side plate is exposed only at a position corresponding to the corner of the radio wave absorption panel 10, the reflection surface of the unnecessary radio wave is compared with the support form of the radio wave absorption panel supported only by the H steel support. The area has been greatly reduced. Therefore, according to the panel mounting bracket 28 of the embodiment, the absorption rate of unnecessary radio waves can be significantly increased as compared with the construction method in which the radio wave absorption panel is dropped on the conventional H steel column.

  Further, since the panel mounting bracket 28 is formed with grooves 56, 56 for inserting the cover plate 42 in the vertical direction, the entire length of the plurality of radio wave absorption panels 10, 10,. The cover plate 42 can be mounted from the top to the bottom. In this manner, by forming the grooves 56, 56 for inserting the cover plate 42 in the vertical direction in the panel mounting bracket 28, the cover plate 42 for the plurality of panel mounting brackets 28, 28,. The mounting work becomes easier.

  Further, as shown in FIG. 6, the surface of the side plate 54 of the panel mounting bracket 28 preferably has a vertical side length a and a horizontal side length b of 30 mm or more and two wavelengths or less of the incoming radio wave. . The surface of the side plate 54 of the panel mounting bracket 28 is a surface exposed to the radio wave arrival surface side. When the lengths a and b of one side of the surface of the side plate 54 are equal to or shorter than two wavelengths of the incoming radio wave, reflection of unnecessary radio waves by the surface of the side plate 54 can be suppressed to a small value. Moreover, the length of one side of 30 mm or more is required from the swallowing depth at which the panel mounting bracket 28 supports the radio wave absorption panel 10. Here, if the incoming radio wave is 5.8 GHz, the length of one side is about 103.5 mm or less.

  In the above embodiment, as shown in FIG. 13A, the single cover plate 42 corresponding to the height of the radio wave absorbing wall 14 is used. However, the present invention is not limited to this. For example, as shown in FIG. 13B, the cover plate 42 is divided into a plurality of parts in the length direction, and the cover attached to the lowermost panel mounting bracket 34 (see FIG. 9) among the divided cover plates 43, 43. It is preferable to insert from the plate 43 in order. Thus, for example, when the uppermost radio wave absorption panel 10 is replaced, only the cover plate 43 positioned at the uppermost part may be removed from the panel mounting brackets 28 and 32. Therefore, the radio wave absorbing panel 10 can be replaced in a shorter time than the case of the single cover plate 42 that is not divided. The number of divisions of the cover plate 42 may be divided for each one of the radio wave absorption panels 10 or may be divided for every two.

  FIG. 14 shows another construction example of the radio wave absorbing wall 14 in which the panel mounting brackets 28, 32, and 34 are fixed in advance to a long bracket mounting member 58 and the bracket mounting member 58 is fixed to the H steel column 26. ing.

  As a form of mounting the panel mounting brackets 28, 32, 34 to the H steel column 26, the panel mounting brackets 28, 32, 34 may be directly fixed to the H steel column 26 by welding, bolts, etc., as shown in FIG. The panel mounting brackets 28, 32, and 34 may be fixed to the bracket mounting member 58 in advance, and may be fixed to the H steel column 26 when the radio wave absorbing wall 14 is constructed. Rather than the construction method of fixing the panel mounting brackets one by one to the H steel support 26 at the site, the panel mounting brackets are fixed to the bracket mounting member 58 in advance at the panel mounting bracket manufacturing factory, thereby mounting the brackets on site. Since only the member 58 needs to be fixed to the H-steel column 26, construction workability at the site is improved. The same applies to the panel mounting brackets 30 and 36 located at the left and right ends.

  Further, the radio wave absorption panels 10, 10... By the radio wave absorption wall 14 of the embodiment are two-dot chain vertical surfaces 26A formed by the H steel columns 26, 26... Shown in FIG. On the other hand, the inclination angle θ1 of the radio wave absorption panels 10, 10... Is preferably fixed so as to be 1 to 10 ° toward the radio wave arrival direction. If this inclination angle θ1 is 1 to 10 °, it is easy to insert the radio wave absorption panel into the mounting hardware, so that the construction of the radio wave absorption wall is easy, the mounting bracket is not too large, and there is a problem such as the fit of the radio wave absorption panel. There is little outbreak. In addition, it is possible to prevent the incoming radio wave from directly reaching the cover plate 42 of the connecting portion 38 and reflecting it by this inclination angle. The inclination angle θ1 is more preferably 1 to 5 °, and further preferably 1 to 3 °.

  Further, in the radio wave absorption panels 10, 10... By the radio wave absorption wall 14 of the embodiment, it is preferable that the angle θ2 of the incoming radio wave incident on the radio wave absorption panel is 0 to 80 °. In ITS-DSRC, when the communication zone is widened, the directivity axis angle increases, and the angle at which radio waves enter the communication zone increases. This incident angle is preferred because these hit the road side sound structures, retaining walls, underpasses on the road, tunnels, side walls, ceilings, and road structures such as signs and diffuse the communication zone by re-reflection. . The incident angle θ2 is more preferably 5 to 70 °, and further preferably 10 to 60 °.

  In the radio wave absorption wall 14 shown in FIG. 3, the radio wave absorption panels 10 and 10 adjacent in the vertical direction are fixed to the panel mounting bracket 28 with an interval s of 10 mm or more and 1 wavelength or less of the incoming radio wave. Is preferred.

  When the interval between the radio wave absorption panels 10 and 10 adjacent in the vertical direction is less than 10 mm, the radio wave absorption panels adjacent in the vertical direction when the radio wave absorption panel 10 is inserted into and extracted from the panel mounting brackets 28 and 28 from the above-described construction method. Since there exists a possibility of interfering with the panels 10 and 10, construction of the electromagnetic wave absorption panel 10 becomes difficult. In addition, if the wavelength of the incoming radio wave exceeds one wavelength, the radio wave is easily transmitted. Here, if the incoming radio wave is a radio wave of 5.8 GHz, the interval s is about 51.7 mm or less.

  In addition, as shown in FIGS. 13 to 15, in the radio wave absorption wall 14, it is preferable that a radio wave absorption panel fall prevention wire 60 connected to the radio wave absorption panel 10 is attached to the panel mounting bracket 28.

  By connecting the radio wave absorption panel 10 to the panel mounting brackets 32, 28 and the like via the fall prevention wire 60 in this way, the radio wave absorption when the radio wave absorption panel 10 is dropped from the panel mounting brackets 32, 28, etc. The panel 10 can be prevented from falling off the radio wave absorbing wall 14. Note that the number, connection position, and length of the drop-off preventing wires 60 in one radio wave absorption panel 10 are appropriate, but the radio wave absorption panel 10 dropped from the panel mounting brackets 28, 30 and the like does not fall on the road surface. It is more preferable to set to. FIG. 15 shows an example in which two wires 60 and 60 are connected in the vicinity of the left and right ends of the rib 62.

  One end of the drop-off prevention wire 60 is directly fixed to the panel mounting bracket side by bolting, a ring-shaped mounting bracket, welding or the like. On the other hand, since it is difficult to fix the other end of the drop-off prevention wire 60 directly to the glass-made radio wave absorption panel 10, as shown in FIG. 15, a rib 62 fitted to the upper edge of the radio wave absorption panel 10 is used. It is fixed directly by bolting, ring-shaped mounting bracket, welding or the like. The rib 62 is also fitted to the lower edge of the radio wave absorption panel 10, and the fitting claws 64, 64... With the radio wave absorption panel 10 have a predetermined area so as to be exposed on the radio wave arrival surface side with a minimum area. A plurality are formed at intervals.

  In FIG. 16, an example of a joint portion between the panel mounting bracket 28 and the radio wave absorption panel 10 is shown in a longitudinal sectional view.

  As shown in the figure, the edge of the radio wave absorption panel 10 is held by a rib 62, and the lower edge of the edge of the radio wave absorption panel 10 is supported by the rib 62 via a setting block 66. Both sides thereof are supported via backup materials 68 and 68, and a sealing material 70 that ensures water tightness is placed on the backup materials 68 and 68. Reference numeral 72 denotes a base frame of the rib 62.

  The edge of the rib 62 is supported on the panel mounting bracket 28 via the setting block 74, and both sides thereof are supported via the gasket 76 and the hollow gasket 78.

  5 is slightly different from the structure of the joint shown in FIG. 16, but the basic configuration is the same.

  Next, the panel mounting brackets 30 to 36 will be described.

  The panel mounting bracket 30 shown in FIG. 7 is fixed to the four corners of the radio wave absorbing wall 14, and is formed with only U-shaped grooves 44 that hold the corners of the single radio wave absorbing panel 10. The opening part of is closed by a closing member 40. Reference numeral 45 denotes a top plate or a bottom plate, which functions as a top plate when attached to the upper corner of the radio wave absorbing wall 10 and functions as a bottom plate when attached to the lower corner.

  The panel mounting bracket 32 shown in FIG. 8 is fixed to the upper side excluding the upper corner of the radio wave absorbing wall 14, and U-shaped grooves 44 and 46 are formed. Reference numeral 47 corresponds to a support plate and is a top plate.

  The panel mounting bracket 34 shown in FIG. 9 is fixed to the lower side excluding the lower corner of the radio wave absorbing wall 14, and since this configuration has been described above, the description thereof is omitted here.

  The panel mounting bracket 36 shown in FIG. 10 is fixed to the left and right side portions excluding the four corners of the radio wave absorbing wall 14, and only the U-shaped grooves 44, 44 are paired vertically. .

[Industrial use]
In the embodiment, the panel mounting bracket for supporting the radio wave absorption panel 10 made of non-tempered glass has been described. However, a radio wave absorption panel made of tempered glass can also be applied. However, since no drilling is required for the radio wave absorption panel in construction, non-tempered glass is advantageous in terms of cost. Moreover, it is not limited to glass, but can be applied to a resin-made radio wave absorption panel.

Sectional drawing of the electromagnetic wave absorption panel which concerns on embodiment Schematic structure diagram of ETC facility Front view of radio wave absorption wall viewed from the direction of radio wave arrival Plan view of the electromagnetic wave absorbing wall shown in FIG. The principal part expanded sectional view of the electromagnetic wave absorption wall shown in FIG. The perspective view of the panel mounting bracket of embodiment Perspective view of panel mounting bracket fixed to corner of radio wave absorption wall A perspective view of the panel mounting bracket fixed to the upper edge of the electromagnetic wave absorbing wall Perspective view of panel mounting bracket fixed to the lower edge of the radio wave absorption wall A perspective view of the panel mounting bracket fixed to the left and right edges of the radio wave absorption wall Explanatory drawing showing installation procedure of radio wave absorption panel Perspective view of main parts with cover plate attached to panel mounting bracket Perspective view of main part showing a cover plate divided into one sheet Explanatory drawing with panel mounting bracket attached to bracket mounting member Explanatory drawing where drop-off prevention wire is connected to rib of radio wave absorption panel Longitudinal sectional view of the joint between the panel mounting bracket and the electromagnetic wave absorption panel

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Radio wave absorption panel, 12 ... Roadside antenna, 14 ... Radio wave absorption wall, 16 ... Intermediate film, 18 ... Glass plate, 20 ... Glass plate, 22 ... Conductive film, 24 ... Conductive film, 26 ... H steel support | pillar, 28, 30, 32, 34, 36... Panel mounting bracket, 38 .. connecting portion, 40 .. closing member, 42 .. cover plate, 44, 46 .. U-shaped groove, 47, 48, 52. 54 ... Side plate, 56 ... Guide groove, 58 ... Metal fitting member, 60 ... Fall prevention wire, 62 ... Rib, 64 ... Fitting claw, 66 ... Setting block, 68 ... Backup material, 70 ... Seal material, 72 ... Base frame 74 ... Setting block, 76 ... Gasket, 78 ... Hollow gasket

Claims (14)

A panel mounting bracket for vertically mounting a plurality of glass electromagnetic wave absorption panels adjacent to each other in a substantially horizontal direction,
Three side plates whose surfaces are juxtaposed in the vertical direction with two U-shaped grooves that support the lower corners or the upper corners of different radio wave absorption panels in the adjacent part of the radio wave absorption panel adjacent in the substantially horizontal direction And two support plates provided in the horizontal direction between the two side plates, and a continuous portion,
A closing member for closing one of the two side surfaces opened in the length direction of one U-shaped groove of the continuous portion;
Of the two side surfaces opened in the length direction of the other U-shaped groove of the continuous portion, the side member is detachably provided on the side surface opposite to the side surface side where the blocking member is located, A cover plate that is attached after being supported by the connecting portion;
A panel mounting bracket.   The panel mounting bracket according to claim 1, wherein the panel mounting bracket is configured such that the U-shaped groove of the connecting portion is symmetrical with respect to the bottom of the U-shaped groove. A panel mounting bracket for vertically mounting a plurality of glass radio wave absorption panels adjacent to each other in a substantially horizontal direction and a substantially vertical direction,
Two vertically open openings and two downward openings respectively supporting two lower corner portions and two upper corner portions of different wave absorbing panels in adjacent portions of the four wave absorbing panels adjacent in the substantially horizontal direction and the substantially vertical direction A total of four U-shaped grooves with two openings were provided in the horizontal direction at positions that are each in the vertical direction and between the three side plates juxtaposed, and between the two side plates, but not at the ends. A continuous portion composed of two support plates;
A closing member that closes one of the two side surfaces that are open in the length direction of the two U-shaped grooves that form a pair above and below the continuous portion;
Of the two side surfaces opened in the length direction of the other U-shaped groove of the other pair of the continuous portions, the radio wave is detachably provided on the side surface opposite to the side surface where the blocking member is located, A cover plate that is attached after the absorption panel is supported by the connecting portion;
A panel mounting bracket.   The length of the vertical side and the horizontal side of the surface of the panel mounting bracket on which the radio wave arrives is 30 mm or more and 2 wavelengths or less of the incoming radio wave, respectively. Panel mounting bracket as described.   The panel mounting bracket according to any one of claims 1 to 4, wherein a groove for inserting the cover plate in a vertical direction is formed in the panel mounting bracket. A radio wave absorption wall composed of a plurality of the radio wave absorption panels configured in a substantially rectangular shape by the panel mounting bracket according to any one of claims 1 to 5 and attached to a housing,
The panel mounting bracket is a position that supports a corner of the radio wave absorption panel, and the closing member is fixed to the housing in the same direction,
The corner of one of the left and right sides of each of the plurality of the radio wave absorption panels is supported by a U-shaped groove having a blocking member among the connecting portions of the panel mounting bracket at a position that supports the corner. And the corner of the other side of the left and right sides is supported by a U-shaped groove in which the cover plate is located among the consecutive portions of the panel mounting bracket at a position that supports the corner of the other side. ,
The cover plate is continuously attached to one side surface of the U-shaped groove of the connecting portion to which the cover plate is attached over the entire length of the radio wave absorption panel continuously provided in the vertical direction. An electromagnetic wave absorbing wall characterized by   The radio wave absorption wall according to claim 6, wherein the radio wave absorption panel is fixed so that an inclination angle of the radio wave absorption panel with respect to a surface formed by the housing is 1 to 10 degrees toward a radio wave arrival direction.   The radio wave absorption wall according to claim 6 or 7, wherein the radio wave absorption panels adjacent in the vertical direction are fixed to the panel mounting bracket with an interval of 10 mm or more and 1 wavelength or less of an incoming radio wave.   The radio wave absorption wall according to any one of claims 6 to 8, wherein the radio wave absorption panel fall prevention wire connected to the radio wave absorption panel is attached to the panel mounting bracket.   The radio wave absorbing wall according to any one of claims 6 to 9, wherein the cover plate is divided in a length direction thereof. Using the panel mounting bracket according to any one of claims 1 to 5,
The corner of one of the left and right sides of the radio wave absorption panel is inserted through the U-shaped groove on the side where the cover plate is attached among the continuous portions of the panel mounting bracket at a position supporting the corner,
The corner of the other side of the left and right sides is directed toward the U-shaped groove on the other side of the panel mounting bracket at a position that supports the corner of the other side where the blocking member is located. Tilt and insert it into the U-shaped groove on the side of the closure member,
The cover plate is attached to one side surface of the U-shaped groove of the continuous portion to which the cover plate is attached,
A method of mounting a radio wave absorption panel, wherein a corner of the radio wave absorption panel is fixed to the panel mounting bracket. Using the panel mounting bracket according to any one of claims 1 to 5,
The panel mounting bracket is fixed to the housing at a position that supports a corner of the radio wave absorption panel, and the closing member is in the same direction,
The corner of one of the left and right sides of the radio wave absorption panel is inserted through the U-shaped groove on the side where the cover plate is attached among the continuous portions of the panel mounting bracket at a position supporting the corner,
The corner of the other side of the left and right sides is directed toward the U-shaped groove on the other side of the panel mounting bracket at a position that supports the corner of the other side where the blocking portion is located. Tilt and insert into the U-shaped groove on the side with the obstruction,
The cover plate is continuously attached to one side surface of the U-shaped groove of the connecting portion to which the cover plate is attached over the entire length of the radio wave absorption panel continuously provided in the vertical direction. ,
A method for constructing a radio wave absorbing wall, comprising the radio wave absorbing wall comprising the radio wave absorbing panel.   The construction method of a radio wave absorption wall according to claim 12, wherein the cover plate is divided in a length direction thereof, and is inserted in order from the cover plate attached to the lowermost continuous portion of the divided cover plates. .   The construction method of a radio wave absorption wall according to claim 12 or 13, wherein the panel mounting bracket is fixed to a long bracket mounting member and is fixed to the casing via the bracket mounting member.

Images