JP3569220B2 - Mounting structure of radio wave absorption panel - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure for a radio wave absorbing panel.
[0002]
[Prior art]
In recent years, an automatic toll collection (ETC) system for toll roads, which is a field of expressway traffic systems, has entered the stage of practical use. The ETC system aims to eliminate congestion by non-stop at tollgates, cope with cashlessness, unmanned at tollgates, and the like.
[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 only reaches the vehicle-mounted device directly from the roadside antenna, no problem occurs, but the radio wave transmitted from the roadside antenna is reflected once on the road surface and further After being reflected again on the ceiling surface of a structure (on a toll road), the radio wave reaches the above-mentioned vehicle-mounted device, and there is a risk of malfunction such as collecting the toll twice regardless of the passage once. Was.
[0004]
Therefore, the present inventors are researching and developing mounting a radio wave absorbing panel for reducing or eliminating radio wave reflection on a ceiling surface of a structure (on a toll road) such as the above tollgate.
[0005]
[Problems to be solved by the invention]
As described above, since the radio wave absorbing panel is mounted on a structure located on a toll road, it is required that the operation be performed quickly in a short time and that the panel be firmly and securely mounted.
[0006]
Conventionally, mounting methods such as forming a screw hole on the ceiling surface side of the above-described structure on a toll road and screwing a bolt into the screw hole have been performed.
However, since a large number of bolts are required to attach one radio wave absorbing panel to the ceiling side of the above structure, it takes a long time to install the bolts, causing a long period of traffic congestion, or There was also a danger that workers could get involved in traffic accidents. Further, there is a possibility that the bolts gradually loosen due to the running vibration of the vehicle, and the bolts fall to the road surface.
[0007]
An object of the present invention is to solve such a problem and to mount a radio wave absorbing panel safely, quickly and efficiently on a toll road.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, the present invention provides a mounting structure for mounting a radio wave absorbing panel on a ceiling surface of a structure, wherein a plurality of long holes are provided in the member to be mounted on the ceiling surface side, A mounting hole is provided in the radio wave absorbing panel at a position corresponding to the elongated hole, a bolt member is inserted through the mounting hole from below, and an upper end of the bolt member inserted through the mounting hole. A nut is attached to the side, and the nut can pass through the elongated hole in a longitudinally aligned state in plan view, and cannot pass through the elongated hole in a state rotated at least about 90 ° in plan view. An elongated lower surface that is hookable on the upper surface of the attached member, and a detent that protrudes from the lower surface and corresponds to the longitudinal inner surface of the elongated hole. Has a detent ridge,
The radio wave absorbing panel is temporarily assembled with the bolt member so that the nut can be inserted into the long hole in a longitudinally aligned state with respect to the long hole in a plan view, and the radio wave absorbing panel is temporarily assembled, and the radio wave absorbing panel in the temporarily assembled state is provided. The nut is inserted into the elongated hole of the mounted member, and the bolt member is moved in the nut screwing direction in a nut moving allowance larger than a thickness dimension of the mounted member penetrating the elongated hole. Rotate the bolt member until the nut reaches the crushed portion formed at the upper end of the bolt member, push up the bolt member, rotate the bolt member at least about 90 ° , and part is screwed forward the bolt member fitted in the long hole and the engaging lower surface portion is hooked to the upper surface of the member being attached to the attached member and the radio wave absorbing panel at the bolt member and the nut Structure to attach It is.
Further, after the nut is attached to the bolt member, the above-mentioned screw crushed portion is formed as a process for preventing the nut from falling off.
Further, the radio wave absorbing panel is attached to the structure at the tollgate in the automatic toll collection system.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
[0010]
First, an example of the radio wave absorbing panel is shown in an exploded perspective view of FIG. 1, a plan view of FIG. 2, and an enlarged sectional view of a main part of FIG. The radio wave absorbing panel P is composed of, for example, a radio wave absorber 1, an FRP plate 2 which is integrally laminated below the radio wave absorber 1, and an integrated connection of the radio wave absorber 1 and the FRP plate 2 with screws 3 or the like. And a metal frame 4 in the form of a girder, lattice or stripe, and a metal plate (steel plate) 5 on the upper surface. Each component of the metal frame 4 is shown as a hat-shaped cross section (see FIG. 3).
[0011]
Incidentally, a large number of mounting holes 6 are provided along the four sides of such a rectangular plate-shaped radio wave absorbing panel P. Specifically, as shown in FIGS. 3 and 6, a hole having a diameter slightly larger than a bolt member 10 to be described later is formed through the metal plate 5 and the ceiling surface of the component (of the metal frame 4). At the same time, a short tubular sleeve 7 is inserted into and fixed to the radio wave absorber 1 and the FRP plate 2 so as to contact the lower surface of the opening edge of the hole. It can be said that the mounting hole 6 is formed mainly by the inner surface of the sleeve 7.
[0012]
Next, a mounting structure for mounting the radio wave absorbing panel P having such a structure on the ceiling surface 8 of a structure F such as a tollgate on a toll road will be described.
[0013]
3 to 17, reference numeral 9 denotes a member to be mounted on the ceiling surface 8 side, and in the illustrated example, a cross-section L-shaped steel (angle material) 11.
A plurality of long holes 12 are provided in the horizontal piece 11a of the L-shaped steel (angle material) 11 along the longitudinal direction. When viewed in a plan view, the attached member 9 (angle member 11) is arranged in a cross-girder shape or a lattice shape or a stripe shape (not shown), and a long hole of the attached member 9 (angle member 11). 12 and the mounting holes 6 of the panel P are previously arranged so as to correspond to each other when viewed in a plan view.
The shape of the long hole 12 is a rectangular shape as shown in FIG. 4 or an oval shape as shown in FIG.
[0014]
The bolt member 10 is inserted into the mounting hole 6 from below the panel P. A nut 13 is provided near the upper end of the bolt member 10 that has passed through the mounting hole 6 in this manner. After screwing the nut 13 near the upper end of the bolt member 10, the thread at the uppermost end of the bolt member 10 is crushed to form a crushed portion 19, so that the nut 13 is prevented from falling off. For example, a subassembly state in which one or more pitches of the screw thread are crushed by two or more widths is set. As described above, after the nut 13 is attached to the bolt member 10 and the nut is prevented from falling off, the bolt member 10 can be reliably prevented from coming off due to the running vibration of the vehicle or the like. (Of course, it can be prevented from coming off during the mounting work.)
As shown in the perspective view of FIG. 7, the cross-sectional front view of FIG. 8, and the bottom view of FIG. 9, the nut 13 has an elongated shape such as a rectangular shape in plan view, and has a screw hole 14 at the center. It is T-shaped when viewed from the front.
[0015]
In addition, as shown in FIGS. 11, 13B and 14B, the longitudinal direction coincides with the longitudinal direction of the nut 13 and the longitudinal direction of the long hole 12 of the rectangular nut 13 in plan view. In the state (1) in which the long axis direction coincides, the shape and size of the nut 13 are set slightly smaller than the shape and size of the long hole 12 so that the nut 13 can pass through the long hole 12. Then, as shown in FIG. 4 or FIG. 5, and FIG. 15 (B), FIG. 16 (B), and FIG. 17 (B), the longitudinal directions of both are crossed in an X-shape, and are shifted by about 90 °, for example. When the nut 13 is rotated at least about 90 °, the nut 13 is set in a shape and a size that cannot pass through the elongated hole 12. 9a (the upper surface of the horizontal piece portion 11a) has a hooking lower surface portion 15 which can be hooked freely. As shown in FIG. 6, it can be said that it has a rotation-stop protruding portion 17 which becomes a rotation-stop corresponding to the longitudinal inner surfaces 16, 16 of the long hole 12.
[0016]
7 to 9, the anti-rotation protrusion 17 has a square shape when viewed from the bottom surface. In this manner, the radio wave absorbing panel P is attached to the attached member 9 by the bolt member 10 and the nut 13, and will be described in more detail in the following order.
[0017]
As shown in the cross-sectional front view of FIG. 10, the plan view of FIG. 11, and the cross-sectional side view of FIG. 12, preferably, they are temporarily fixed (temporarily assembled) in advance. That is, in the factory shipping state or the like, the longitudinal direction (long side direction or long axis direction) of the long holes 12... Direction), the nut 13 and the bolt member 10 are lightly fastened to each other, and the panel P is pressed against the attached member 9 (the horizontal side portion 11a of the angle member 11) from below at the site. Then, all the nuts 13 can be inserted into the elongated holes 12 to a half depth (as shown in FIGS. 10 to 12).
[0018]
Next, the bolt member 10 is rotated in the nut retreating direction as shown by the arrow B in FIG. The nut 13 is prevented from rotating by the elongated hole 12 and can be easily rotated in the direction of arrow B, and reaches the crushed portion 19 as shown in FIG. Therefore, after the bolt member 10 is pushed up as shown by the arrow C in FIG. 14 and then rotated in the direction of the arrow E by an angle θ of about 90 ° as shown in FIG. 15, as shown in FIG. 14B to FIG. In addition, in a plan view, the longitudinal direction of the nut 13 is orthogonal to the longitudinal direction of the long hole 12 (by rotating by about 90 °).
[0019]
In addition, the movement allowance G in which the nut 13 can move in the axial direction with respect to the bolt member 10 from the state of FIGS. 3 and 6 to the state of FIG. It is necessary to previously set the thickness slightly larger than the thickness T of the side portion 11a. Thereafter, when the bolt member 10 is pulled in the direction of the arrow J as shown in FIGS. 15 to 16, the anti-rotation protrusion 17 of the nut 13 fits into the elongated hole 12, and the nut 13 is locked so as not to rotate.
[0020]
Then, if the bolt member 10 is screwed in the direction of the arrow K as shown in FIG. 17, the mounting state shown in FIGS. 3 to 6 is obtained from FIG. 17, and the work is completed easily and quickly. Note that the sleeve 7 prevents local deformation of the panel P even when the bolt member 10 is strongly fastened, and realizes a firm attachment.
[0021]
The present invention can be freely changed in design other than the above-described embodiment. For example, the shapes of the nut 13 and the long hole 12 can be passed in a state where they coincide with each other in the longitudinal direction, and about 90 ° It can be designed in various shapes as long as it is an elongated shape in a plan view that cannot pass in a rotated state (a plan view, a state in which the longitudinal directions cross each other). Also, the detent ridge may be a polygon other than a square when viewed from the bottom, a round shape with two chamfers, or the like. In addition, the mounting member 9 may be a channel material, a hat-shaped material, or other various shapes other than the angle material 11. Also, instead of the screw crushing portion 19 at the upper end (tip) of the bolt member 10, the screw valley may be filled by welding, or the screw valley may be filled with an adhesive or the like, so that the nut 13 is prevented from falling off. good.
[0022]
【The invention's effect】
The present invention has the following significant effects by the above configuration.
(1) The radio wave absorber 1 can be easily and quickly attached to a structure such as a toll road.
{Circle around (2)} Accordingly, the construction period can be shortened, traffic congestion can be reduced, and the safety of workers in dangerous places where cars pass can be improved.
{Circle around (3)} (according to claim 2), it is possible to prevent the bolt member 10 from dropping (falling out) due to vibrations or the like during traveling of the vehicle (vehicle), and to avoid danger to the traveling vehicle (vehicle).
{Circle around (4)} As described above, the present invention can contribute to the spread of the automatic toll collection (ETC) system.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an example of a radio wave absorbing panel.
FIG. 2 is a plan view of the radio wave absorbing panel.
FIG. 3 is a cross-sectional front view of a main part showing an embodiment of the present invention and showing a completed mounting state.
FIG. 4 is a plan view.
FIG. 5 is a plan view showing a modification.
FIG. 6 is a sectional side view of a main part of FIG. 3;
FIG. 7 is a perspective view showing an example of a nut.
FIG. 8 is a sectional front view of a nut.
FIG. 9 is a bottom view of the nut.
FIG. 10 is a sectional front view of a main part showing a temporarily fixed state.
FIG. 11 is a cross-sectional plan view of a main part showing a temporarily fixed state.
FIG. 12 is a sectional side view of a main part showing a temporarily fixed state.
FIG. 13 is an explanatory view showing a first mounting step.
FIG. 14 is an explanatory view showing a second mounting step.
FIG. 15 is an explanatory view showing a third mounting step.
FIG. 16 is an explanatory view showing a fourth mounting step.
FIG. 17 is an explanatory view showing a fifth mounting step.
[Explanation of symbols]
6 Mounting hole 8 Ceiling surface 9 Attached member 9a Upper surface 10 Bolt member 12 Slot 13 Nut 15 Hook lower surface 16 Inner surface 17 Detent ridge F Structure P Radio wave absorption panel

Claims (3)

In the mounting structure for mounting the radio wave absorbing panel on the ceiling surface of the structure, a plurality of long holes are formed in the member to be mounted on the ceiling surface side, and the radio wave absorbing panel corresponds to the long holes. A mounting hole is penetrated at a position where the bolt member is inserted through the mounting hole from below, and a nut is provided near the upper end of the bolt member inserted through the mounting hole. It can pass through the elongated hole in the longitudinal direction coincident state in plan view, and is an elongated shape in plan view that cannot pass through the elongated hole in a state where it is rotated at least about 90 °, and on the upper surface of the attached member. A locking lower surface portion, and a detent protruding portion protruding from the locking lower surface portion and serving as a detent corresponding to the longitudinal inner surface of the elongated hole,
The radio wave absorbing panel is temporarily assembled with the bolt member so that the nut can be inserted into the long hole in a longitudinally aligned state with respect to the long hole in a plan view, and the radio wave absorbing panel is temporarily assembled, and the radio wave absorbing panel in the temporarily assembled state is provided. The nut is inserted into the elongated hole of the mounted member, and the bolt member is moved in the nut screwing direction in a nut moving allowance larger than a thickness dimension of the mounted member penetrating the elongated hole. Rotate the bolt member until the nut reaches the crushed portion formed at the upper end of the bolt member, push up the bolt member, rotate the bolt member at least about 90 ° , and part is screwed forward the bolt member fitted in the long hole and the engaging lower surface portion is hooked to the upper surface of the member being attached to the attached member and the radio wave absorbing panel at the bolt member and the nut To install Mounting structure of the radio wave absorber panel, wherein. 2. The mounting structure for a radio wave absorbing panel according to claim 1 , wherein said screw crushed portion is formed as a nut preventing process after the nut is attached to the bolt member. 3. The mounting structure for a radio wave absorbing panel according to claim 1, wherein the radio wave absorbing panel is mounted on the structure at a tollgate in an automatic toll collection system.

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