JP2004270393A - Radio wave absorption panel mounting structure and mounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio wave absorption panel mounting structure allowing positive and easy radio wave absorption panel mounting work in a short construction period while making a radio wave absorption panel detachable leaving a scaffolding as it is after laying. <P>SOLUTION: A scaffolding board 5 on the upper layer side and the radio wave absorption panel 6 on the lower layer side are connected by a connecting member to have a prescribed clearance A to form an integral composite panel body 1. Between a plurality of cross beams 4 disposed parallel at the back 11 of a high level road, the composite panel body 1 is fittedly inserted in a part of each cross beam 4 so that the scaffolding board 5 and the radio wave absorption panel 6 vertically hold a part of each cross beam 4 between. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure of a radio wave absorbing panel and a mounting method thereof.
[0002]
[Prior art]
2. Description of the Related Art In recent years, an automatic toll collection (ETC) system for toll roads, which is one field of the expressway traffic system, has been adopted. The ETC system aims to eliminate congestion due to non-stop of vehicles at toll booths, cope with cashlessness, and make unmanned at toll booths.
[0003]
In this ETC system, radio waves are transmitted from a roadside antenna installed on the upper side of an arched gate (gantry) toward a road, and both a vehicle-mounted device of a vehicle traveling on the road and the roadside antenna are used. Communication is performed. At this time, if the radio wave of the vehicle-mounted device directly arrives only from the roadside antenna, no problem occurs.However, the radio wave transmitted from the roadside antenna is reflected once on the road surface, and furthermore, Re-reflection on the back side {backside of another elevated road} of another elevated road provided to intersect or parallel to the above road near the tollgate causes the following problem. In other words, when the radio wave is reflected again on the underside of the viaduct, the radio wave arrives again at the on-vehicle device, and there is a risk of an erroneous operation such as collecting the fee twice regardless of one pass.
Therefore, a radio wave absorbing panel for reducing or eliminating the reflection of radio waves is mounted on the back side of the elevated road near the tollgate or the like (on the back of the elevated road).
[0004]
Conventionally, as a method of mounting the radio wave absorbing panel on the underside of the elevated (sometimes behind the girder), assemble the scaffold from the ground, work from this scaffold to the underside of the elevated, attach the radio wave absorbing panel, and then use this scaffold The method of dismantling was used, and in the case of repair work, repair work was similarly performed from the scaffold assembled on the underside of the viaduct, and then this scaffold was dismantled.
However, in such a method of mounting the radio wave absorbing panel, it is necessary to restrict the traffic of a vehicle traveling under an elevated girder for a long period of time.
In order to solve such a problem, there has been proposed a configuration in which a radio wave absorbing panel is also used as a scaffold (for example, see Patent Documents 1 and 2).
[0005]
[Patent Document 1]
Japanese Patent No. 3084009 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-234312
[Problems to be solved by the invention]
However, the structure in which the upper surface of the radio wave absorbing panel also serves as a scaffold and such an attachment method have the following problems. That is, (1) the panel cannot be used as a scaffold depending on the number of panels to be replaced, and the work efficiency is reduced. {Circle over (2)} When there is a portion where the panel is removed, the feet of the worker are dangerous, and there is a risk of falling. In addition, since there is no scaffold, it is difficult to repair the underside of the overpass (back of the girder).
[0007]
There were the above problems (1) and (2). The present invention solves the above problems (1) and (2) and provides a mounting method and a mounting structure that can securely and easily mount the radio wave absorbing panel in a short period of time and have high safety. Another object of the present invention is to provide a mounting structure and a mounting method of a radio wave absorbing panel from which a radio wave absorbing panel can be removed without leaving a scaffold after installation.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a mounting structure of a radio wave absorbing panel according to the present invention is an integrated composite in which an upper scaffold plate and a lower radio wave absorbing panel are connected by a connecting member so as to have a predetermined gap. A panel body, a plurality of cross beams arranged in parallel on the underside of the viaduct, and both end sides of the composite panel body, the scaffold plate and the radio wave absorption panel move up and down a part of the cross beam or the cross beam by the gap. It was sandwiched and attached.
Further, the composite panel body has a spacer member for maintaining the predetermined gap between the scaffold plate and the radio wave absorbing panel.
[0009]
Further, in order to achieve the above-mentioned object, a method of mounting a radio wave absorbing panel according to the present invention includes mounting a plurality of cross beams on an underside of an elevated side so that the cross beams are parallel to each other, and then, a scaffold plate on an upper layer side and a lower side The scaffold plate and the radio wave absorbing panel are partially separated from each other by the gaps, so that the scaffold plate and the radio wave absorbing panel are partially connected to each other by the connecting member. Is attached to the above-mentioned cross beam so as to sandwich it vertically.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
[0011]
In the partially cutaway perspective explanatory view shown in FIG. 1, reference numeral 10 denotes an elevated road, and an elevated back (girder back) 11 is provided with a plurality of elevated elevated main girders 12 such as H-beams in the longitudinal direction. Is established. A vertical beam 3 of H-section steel or the like is suspended in a suspended state by a suspension member (cable) 2a at a position below and parallel to the main girder 12. Then, as shown in the perspective explanatory view of FIG. 2, the cross beams 4 are abutted and fixed to the lower surfaces of the plurality of vertical beams 3 orthogonally to the vertical beams 3 in plan view. That is, a large number of cross beams 4 are arranged in parallel in the width direction (left-right direction) orthogonal to the longitudinal direction of the elevated road 10, and the vertical beams 3 and the cross beams 4 form a cross-girder shape in plan view.
[0012]
The cross beam 4 is a member for fixing the composite panel body 1 and has an I-shaped cross section as viewed in the longitudinal direction thereof. The structure may be as follows. That is, the cross beam 4 is composed of an upper flange plate portion 13, a lower flange plate portion 14, and an intermediate connecting plate portion 15 for connecting the upper flange plate portion 13, the upper flange plate portion 13 and the lower surface of the vertical beam 3 and the bolts and nuts. It is connected by a fixing member such as or welding. Further, the cross beam 4 is a long beam member having the same I section in the longitudinal direction, and the end 4a is also I-shaped in cross section as shown in FIG.
[0013]
4, 5, and 6 are a plan view, a side sectional view, and a front sectional view of the composite panel body 1. In these figures, the radio wave absorbing panel 6 attached to the elevated backside 11 by the attachment structure according to the present invention. Are pre-configured together with the scaffold plate 5 as the composite panel body 1. The composite panel body 1 has a connecting member 7 such that the upper scaffold plate 5 and the lower radio wave absorption panel 6 have a predetermined gap A. And are integrated.
[0014]
The radio wave absorbing panel 6 is also called an electromagnetic wave absorbing panel, and includes, for example, a radio wave absorbing main body having a rectangular plate shape in a plan view, a surface plate material (FRP plate) laminated on the lower surface side of the radio wave absorbing main body, and an upper surface of the radio wave absorbing main body. In addition, it is configured to have a protection plate material or the like for protecting the side surface, and is a rectangular plate-shaped panel member. It should be noted that the radio wave absorption body may be made of a conventionally known material and configuration.
[0015]
As shown in FIGS. 4 to 6, the scaffold plate 5 has (substantially) the same size (vertical and horizontal dimensions) of the radio wave absorbing panel 6 in plan view, or the size of the scaffold plate 5 as shown in FIG. And the size (dimensions) of the radio wave absorbing panel 6 are different from each other. The illustrated scaffold plate 5 is a scaffold member having a corrugated cross section formed by bending a metal plate into a corrugated shape, and is lightweight and rigid. Thereby, even if the composite panel body 1 has a large area, it is lightweight and easy for an operator to handle during construction.
[0016]
FIG. 7 is a cross-sectional view of a main part showing a connecting portion between the scaffold plate 5 and the radio wave absorbing panel 6. The scaffold plate 5 and the radio wave absorbing panel 6 have a gap A of a predetermined size and are connected to each other by the connecting member 7. They are connected to form a panel. Further, the composite panel body 1 has a spacer member 8 for maintaining the predetermined gap A between the scaffold plate 5 and the radio wave absorbing panel 6.
[0017]
The connecting member 7 and the spacer member 8 will be described. As shown in FIG. 7, the connecting member 7 is a bolt 16 and a nut member 17 (especially an eye nut) screwed to the bolt 16, and a scaffold plate on the upper layer side A bolt 16 is inserted from the side of the radio wave absorbing panel 6 into a through hole provided in each of the radio wave absorbing panel 6 and the lower radio wave absorbing panel 6, and a nut member 17 connects the scaffolding plate 5 and the radio wave absorbing panel 6 on the scaffold plate 5 side. They are connected by sandwiching them.
In addition, by using the nut member 17 as an eye nut, it functions as a part of the connecting member 7 between the radio wave absorbing panel 6 and the scaffold plate 5, and a jig for inserting a fall prevention wire 19, which will be described later, and construction. In this case, it can also function as a jig for suspending the composite panel body 1.
[0018]
The spacer member 8 is, for example, a member having a ring shape or a C-shape. When the scaffold plate 5 and the radio wave absorbing panel 6 are connected in advance by the bolts 16 and the nut members 17, the radio wave absorbing panel 6 is connected to the It is arranged between the plate 5 and inserted into the bolt 16. Then, the dimension of the height t of the spacer member 8 becomes the predetermined gap A between the radio wave absorbing panel 6 and the scaffold plate 5. Further, the spacer member 8 may be a plate member having a height t, and may be sandwiched between the radio wave absorbing panel 6 and the scaffold plate 5 near the bolt 16.
[0019]
In addition, since the scaffold plate 5 has a configuration in which the plate is bent in a corrugated shape as described above, the connecting member 7 can be shortened and firmly arranged by disposing the connecting member 7 in the concave portion 20 of the scaffold plate 5. Can be fixed. Then, as shown in FIGS. 4 and 6, connecting members 7, 7 are arranged at intervals (two places) in a concave portion 20 provided at the center of the composite panel body 1, and the connecting members 7, 7 are provided. Form an integral panel.
[0020]
As shown in FIG. 4, the vertical dimension B of the scaffold plate 5 (the entire composite panel body 1) of the composite panel body 1 is larger than the dimension D between the intermediate connecting plate parts 15, 15 of the adjacent cross beams 4, 4. It has a small dimension (B <D) and is larger than the dimension E between the lower flange plate portions 14 and 14 (or the upper flange plate portions 13 and 13) of the adjacent cross beams 4 and 4 (E <B). It is set to be. In other words, the horizontal beams 4, 4 are connected to the vertical beams 3 so that the vertical dimension B of the composite panel body 1 and the dimensions D, E between the horizontal beams 4, 4 satisfy the above relationship. As will be described later with reference to FIG. 8, the size (dimensions) of the scaffold plate 5 and the size (dimensions) of the radio wave absorbing panel 6 may be the same or different.
[0021]
Then, as shown in the perspective explanatory view of FIG. 3, the composite panel body 1 is attached to the cross beams 4 and 4. More specifically, a plurality of cross beams 4 (between the cross beams 4 and 4) arranged in parallel with the underpass 11, both ends of the composite panel body 1 in the longitudinal direction are separated from the scaffold plate 5 and the radio wave absorption panel by the gap A. 6 is a structure in which a part of the cross beam 4 is vertically sandwiched, and is inserted into the cross beam 4 and attached.
That is, as shown in FIGS. 3 to 7, a part of the cross beam 4 is (the one-sided flat portion of) the lower flange plate portion 14 of the cross beam 4, and the lower flange portion is formed by the gap A on both sides of the composite panel body 1. The plate portion 14 is set so that the scaffold plate 5 and the radio wave absorbing panel 6 are sandwiched from above and below, and the composite panel body 1 is attached to the lower flange plate portion 14. In the first embodiment, the gap A is set to be substantially the same as or slightly larger than the thickness of the lower flange plate portion 14 of the cross beam 4.
[0022]
FIG. 8 is a cross-sectional view of a main part showing a fixing portion of the composite panel body 1 to the cross beam 4. The composite panel body 1 has a vertical side edge (both ends) of the panel body 1 to be attached to the cross beam 4. Side) has a connection fixing member 9. The connection fixing member 9 connects the scaffold plate 5 and the radio wave absorbing panel 6, holds (in a supplementary manner) on the integrated panel body 1, and acts for attachment to the cross beam 4. That is, the connecting and fixing member 9 has the bolt 23 and the nut 24 screwed to the bolt 23, and the bolt 23 is inserted from the side of the radio wave absorbing panel 6 into the through hole formed in the scaffold plate 5 and the radio wave absorbing panel 6. The nut 24 is connected to the scaffold plate 5 and the radio wave absorbing panel 6 on the scaffold plate 5 side. Then, for fixing to the cross beam 4, a bolt 23 is inserted through a through (long) hole or notch formed in the cross beam 4, and the composite panel body 1 and the cross beam 4 are fastened and fixed by a nut 24. The bolt 23 and the nut 24 are provided with a locking device.
Also in this connection fixing member 9, it is arranged on the side edge portion (both ends) where the composite panel body 1 is attached to the cross beam 4, and is disposed in the concave portion 20 of the scaffold plate 5.
[0023]
FIG. 9 shows a second embodiment of the mounting structure of the present invention, in which a plurality of (same as above) cross beams 4 (between the cross beams 4 and 4) are arranged in parallel with the elevated back surface 11. At both ends in the vertical direction of the composite panel body 1, the scaffold plate 5 and the radio wave absorbing panel 6 are attached to the cross beam 4 (the whole) by inserting the cross beam 4 into and out of the upper and lower surfaces of the cross beam 4. I have. In this embodiment, the gap A is set to be larger than the height of the cross beam 4. Further, the connecting member 7 includes a connecting member 21 having a substantially Z-shaped or U-shaped cross section, and a bolt / nut member 22 connecting the connecting member 21 to the scaffold plate 5 and the connecting member 21 to the radio wave absorbing panel 6. It is configured.
[0024]
In the first and second embodiments, the scaffold plate 5 is placed and fixed on the upper surface of the lower flange plate portion 14 of the cross beam 4 and the upper surface of the upper flange plate portion 13 of the cross beam 4. Therefore, it is extremely safe even if a load acts on the scaffold plate 5 {even if an operator gets on it}.
Further, the predetermined gap A between the scaffold plate 5 and the radio wave absorbing panel 6 is not shown in the drawings except that it is formed in a uniform size over the entire surface between the scaffold plate 5 and the radio wave absorbing panel 6. A predetermined gap A may be formed at least at the side edges (both ends) in the vertical direction where the mounting member is attached to the cross beam 4.
[0025]
Next, a method (method) of attaching the composite panel body 1 to the back of the elevated (back of the girder) 11 will be described. As shown in FIG. 1, the hanging member 2a is attached to the main girder 12 of the elevated back 11 in a hanging manner. The vertical beam 3 is held in a suspended state by the hanging member 2a and is held in parallel below the main girder 12. Thereafter, as shown in FIG. 2, the horizontal beam 4 is attached to the lower surface of the vertical beam 3 and perpendicular to the plan view by fixing members such as bolts and nuts or by welding. The plurality of (many) cross beams 4 are arranged on the elevated backside 11 in the left-right width direction of the road so that they are parallel to each other.
[0026]
The upper and lower scaffolds 5 and the lower radio wave absorbing panel 6 are connected by a connecting member 7 so as to have a predetermined gap A, and both ends in the longitudinal direction of the composite panel body 1 integrated in advance are defined by the gap A. The scaffold plate 5 and the radio wave absorbing panel 6 are attached to the cross beam 4 in an insertion shape so as to sandwich a part (the lower flange plate portion 14) of the cross beam 4 vertically.
As another embodiment, as shown in FIG. 9, the composite panel body 1 assembled in advance is integrally attached to the lower flange plate portion 14 with the lower flange plate portion 14 vertically sandwiched therebetween. Both ends in the vertical direction of the composite panel body 1 may be attached to the cross beam 4 as a plug-in so that the scaffold plate 5 and the radio wave absorption panel 6 vertically sandwich the cross beam 4 (upper and lower surfaces) with the gap A.
[0027]
As shown in FIG. 3, the composite panel body 1 is attached to the cross beam 4 by inserting the composite panel body 1 from the end 4 a of the cross beam 4 through the gap A of the composite panel body 1 and sliding in the longitudinal direction of the cross beam 4 as shown by an arrow S. We attach sequentially while doing. At the time of this slide insertion work, the connecting and fixing member 9 is detached from the composite panel body 1 and the composite panel body 1 is positioned at a predetermined fixing position. The cross beam 4 and the composite panel body 1 are fixed in the through holes provided in 14.
[0028]
As another mounting method, although not shown, the vertical dimension B of the composite panel body 1 and the dimensions D and E between the cross beams 4 and 4 are appropriately adjusted, and the composite panel body 1 is inclined in the vertical direction. Then, one side edge (upper side) in the vertical direction is inserted into one cross beam 4, and then the other side edge (lower side) is lifted and fitted into the other cross beam 4 (while shifting in the vertical direction). Is also good.
That is, in any case, the composite panel body 1 is safe because the weight of the composite panel body 1 is temporarily deposited in the cross beam 4 and then fixed.
[0029]
Thereafter, as shown in FIG. 4, the fall prevention wire 19 is inserted into (the eye nut of) the connection member 7 of the (plurality of adjacent) composite panel bodies 1 to prevent the composite panel body 1 from unexpectedly falling. Both ends of the wire 19 may be fixed to the vertical beam 3 and the horizontal beam 4.
Although not shown, a plate piece is connected between the main girder 12 and the vertical beam 3 by bolts, nuts or welding to function as a fixed hanging member, and a structure between the main girder 12 and the vertical beam 3 is provided. To be strong. In addition, the suspending member 2a is left as it is, or a part thereof is removed, and the mounting operation of the radio wave absorbing panel 6 is completed.
[0030]
8, the size of the scaffold plate 5 and the size of the radio wave absorbing panel 6 do not need to be the same in the vertical direction and the horizontal direction. The vertical dimension F may be longer than the vertical dimension B of the scaffold plate 5, and the vertical dimension F of the radio wave absorbing panel 6 may be slightly smaller than the center line interval H of the pair of adjacent horizontal beams 4, 4. That is, the vertical dimension F of the radio wave absorbing panel 6 is determined by the center line interval H of the horizontal beams 4 and 4 and the panel clearance G, and the sum of the vertical dimension F of the radio wave absorbing panel 6 and the panel clearance G is equal to the horizontal beam 4. , 4 (F + G = H). Thereby, the composite panel body 1 can be easily attached to the cross beam 4, and the gap between the adjacent radio wave absorbing panels 6, 6 can be eliminated (the gap can be made extremely small). Although not shown, the dimensions of the scaffold plate 5 may be longer than the dimensions of the radio wave absorbing panel 6.
[0031]
The present invention is configured as described above and does not require a scaffold assembled from the ground, so that there is no need to restrict the traffic of vehicles traveling under and below the girder as in the related art. Then, there is an advantage that the maintenance (inspection / repair) of the back of the girder and the radio wave absorbing panel 6 can be easily performed by always walking on the scaffold plate 5. In addition, there is durability against vibration of the elevated road 10.
Further, when the composite panel body 1 is attached to the horizontal beam 4 with the lower flange plate portion 14 vertically interposed therebetween, the composite panel body 1 can be arranged even at a position directly below the vertical beam 3. That is, the radio wave absorbing panel 6 can be disposed on the entire surface without being affected by the width dimension of the elevated backside 11, and can be laid over the entire surface so that there is no gap between the radio wave absorbing panels 6 adjacent to each other.
[0032]
【The invention's effect】
The present invention has the following effects by the above configuration.
[0033]
(According to claim 1) Since the scaffold plate 5 and the radio wave absorbing panel 6 are mounted as a pre-assembled composite panel body 1, the mounting operation can be simplified. In addition, there is no need to separately assemble or disassemble the scaffold assembled from the ground as in the related art, thereby shortening the construction period.
After the installation, the scaffold plate 5 can function independently as a scaffold, and the radio wave absorbing panel 6 can function independently as a panel body for radio wave absorption. That is, by loosening (removing) the connecting member 7, only the radio wave absorbing panel 6 can be removed while the scaffold plate 5 remains, and can be replaced. Even if the radio wave absorption panel 6 is removed for replacement, the repair of the underside of the elevated (back of the girder) 11 and the like can be performed safely by the remaining scaffold plate 5.
Since the gap A is secured when the composite panel body 1 is mounted on the cross beam 4 (according to claim 2), the composite panel body 1 is inserted into the cross beam 4 from the gap A at both ends in the longitudinal direction (longitudinal direction) of the composite panel body 1. , Can be attached to the cross beam 4, and the mounting work can be facilitated.
[0034]
(According to claim 3) Since the scaffold plate 5 and the radio wave absorbing panel 6 are mounted as a pre-assembled composite panel body 1, the mounting operation can be simplified, and a conventional scaffold assembled from the ground is separately assembled or disassembled. The work is eliminated, and the construction period can be shortened. Since the cross beam 4 (or a part thereof) is vertically sandwiched, the composite panel body 1 is extremely easily mounted, and the weight of the composite panel body 1 is temporarily stored in the cross beam 4 and then fixed.
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view showing one embodiment of the present invention and showing a first mounting procedure.
FIG. 2 is an explanatory perspective view showing a second mounting procedure.
FIG. 3 is a perspective explanatory view showing a third mounting procedure.
FIG. 4 is a plan view of the composite panel body.
FIG. 5 is a side sectional view of the composite panel body for explaining an attachment structure.
FIG. 6 is a front sectional view of a composite panel body for explaining an attachment structure.
FIG. 7 is a sectional view of a main part showing a connecting portion between the scaffold plate and the radio wave absorbing panel.
FIG. 8 is an essential part cross-sectional view showing a fixing portion of the composite panel body to a cross beam.
FIG. 9 is a side sectional view showing a second embodiment of the mounting structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Composite panel body 4 Cross beam 5 Scaffolding board 6 Radio wave absorption panel 7 Connecting member 8 Spacer member 11 Elevated back A Clearance

Claims (3)

An integrated composite panel body (1) in which an upper scaffold plate (5) and a lower radio wave absorbing panel (6) are connected by a connecting member (7) so as to have a predetermined gap (A) is formed as an integrated panel. A plurality of cross beams (4) arranged in parallel with the back surface (11) are provided at both ends of the composite panel body (1) by the gap (A) so that the scaffold plate (5) and the radio wave absorbing panel (6) are provided. Characterized in that they are attached with the cross beams (4) to a part of the cross beams (4) up and down. The radio wave absorber according to claim 1, wherein the composite panel body (1) has a spacer member (8) for maintaining the predetermined gap (A) between the scaffold plate (5) and the radio wave absorption panel (6). Panel mounting structure. A plurality of cross beams (4) are attached to the underside of the viaduct (11) so that they are parallel to each other. Next, a predetermined gap (A) is formed between the upper scaffold (5) and the lower radio wave absorbing panel (6). With the gap (A), the scaffold plate (5) and the radio wave absorbing panel (6) are connected to each other by the gap (A). A method for mounting a radio wave absorbing panel, wherein the cross beam (4) or a part of the cross beam (4) is inserted and attached to the cross beam (4) so as to sandwich the cross beam vertically.

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