JP4083489B2 - Mounting method of radio wave absorption panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method Mounting of the radio wave absorption panel.
[0002]
[Prior art]
In recent years, an automatic toll collection (ETC) system for toll roads, which is a field of highway traffic systems, has been adopted. With this ETC system, the company is trying to resolve non-stop traffic jams at the toll gate, deal with cashlessness, and unmanned at the toll gate.
[0003]
In this ETC system, radio waves are transmitted toward the road from the roadside antenna installed on the upper side of the arched gate (gantry), and both between the vehicle-mounted device and the roadside antenna traveling on this road. Communication. At that time, there is no problem if the radio wave of the vehicle-mounted device only reaches directly from the roadside antenna, but the radio wave transmitted from the roadside antenna is reflected once on the road surface, The following problems occur when re-reflecting on the back side of another elevated road that crosses or is parallel to the above road in the vicinity of the toll booth. That is, when the radio wave is re-reflected behind the overhead, the radio wave reaches the vehicle-mounted device again, and there is a risk of erroneous operations such as collecting charges twice regardless of whether the vehicle passes once.
In view of this, a radio wave absorption panel for reducing or eliminating radio wave reflection is attached to the back side of the elevated road in the vicinity of the toll booth.
[0004]
Conventionally, as a method of attaching the radio wave absorption panel to the back of the elevated (sometimes called the back of the girder), the scaffold is assembled, the radio wave absorbing panel is attached to the elevated back by working from this scaffold, and then disassembled with this scaffold. In the same way, during the repair work, repair work was performed from the scaffold assembled on the back side of the overpass, and then this scaffold was dismantled.
However, with such a method for mounting a radio wave absorption panel, it has been necessary to restrict traffic for a long period of time for vehicles traveling over the overhead girder.
In order to solve such a problem, Japanese Patent No. 3080409, Japanese Patent Application Laid-Open No. 2000-234312, etc. propose a method of using the radio wave absorption panel as a scaffold.
[0005]
[Problems to be solved by the invention]
However, the method of using the upper surface of the radio wave absorption panel as a scaffold and such a mounting structure have the following problems. That is, (1) If there is a place where the panel is removed, the operator's feet are dangerous and may fall. In addition, since there is no scaffold, it is difficult to repair the back of the elevated (the back of the girder). (2) Since it is necessary to align the panel while measuring the radio wave (electromagnetic wave) absorption characteristics of the radio wave absorption panel, it takes time to complete as a scaffold.
[0006]
There were problems (1) and (2) as described above. The present invention, such a problem (1) (2) Solution to the a possible installation work reliably wave absorption panel at a short construction period, and to provide a highly safe attachment how as one object, also, the scaffold is a can be attached in the scaffold, Ketaura mounting how the panel can be performed without waiting for the installation of panel repair (elevated back) (attached), provides To do other purposes.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the mounting method of the radio wave absorption panel according to the present invention is such that the lower surface is provided with a horizontal beam provided with a first opening groove portion having a lower opening shape having first hooking pieces at both ends. Next, a scaffolding plate made of a metal mesh face is attached to the upper surface of the transverse beam while sliding in the longitudinal direction of the transverse beam, and a first fixing tool is projected upward at a predetermined pitch on the upper surface of the radio wave absorption panel. The radio wave absorption panel is held in the longitudinal direction of the horizontal beams while the first fixing tool is hooked on the first opening grooves on the lower surfaces of the two or more horizontal beams and held in a suspended shape. And a work tool or a jig is inserted from above into the metal mesh face from above, the first fixing tool is rotated, and the radio wave absorption panel is attached in contact with the lower surface of the transverse beam.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
In the partially broken perspective view shown in FIG. 7, reference numeral 10 denotes an elevated road, and an elevated road main girder 12 such as H-shaped steel is disposed in the longitudinal direction (back of the girder) 11 in the longitudinal direction. However, a vertical beam 3 such as H-shaped steel is held in a suspended shape by suspension members 2a and 2b at a position below the main girder 12 in parallel therewith. The transverse beam 4 is fixed in contact with the lower surface of the longitudinal beam 3 so as to be perpendicular to the plan view. That is, a large number of transverse beams 4 are arranged in parallel in the width direction (left-right direction) perpendicular to the longitudinal direction of the elevated road 10.
[0009]
And the scaffold board 5 which consists of metal mesh bodies, such as an expanded metal, is attached to the upper surface 4a of the cross beam 4 (as mounting shape). Specifically, as illustrated in FIGS. 4 to 6 (which will be described in detail later), the scaffold plate 5 is a rectangular plate type in plan view having a peripheral frame 14 and a metal mesh body, and has a long side. Are arranged so as to be orthogonal to each other across the plurality of transverse beams 4 in plan view.
Reference numeral 6 denotes a radio wave absorption panel, which is attached to the lower surface (4b) of the transverse beam 4. This radio wave absorption panel is also called an electromagnetic wave absorption panel. For example, a rectangular plate-shaped radio wave absorption main body, a laminated surface material (FRP plate) on the lower surface side of the radio wave absorption main body, and the radio wave absorption main body and the surface material It is comprised from the reinforcement surface-like member, reinforcement side member, etc. which hold | maintain integrally in panel shape while protecting. As shown in FIGS. 5 and 6 (described later), it is preferable to set the size (vertical / horizontal dimensions) of the radio wave absorption panel 6 to be the same as that of the scaffold plate 5.
[0010]
By the way, as shown in FIG. 7 and FIG. 8 (A), the transverse cross-sectional shape of the cross beam 4 is that the lower surface 4b side has a first opening groove portion 16 having a lower opening shape having first hooking pieces 15 and 15 at both ends. The electromagnetic wave absorbing panel 6 has a lower surface through a first fixing tool 21 inserted into the first opening groove 16 of the cross beam 4 and hooked on the first hooking pieces 15, 15. Attach to 4b.
Furthermore, the upper surface 4a side of the cross beam 4 has a shape including an upper opening-shaped second opening groove portion 18 having second hooking pieces 17 and 17 at both ends, and the second hook on the upper surface 4a side of the cross beam 4 is provided. The said scaffold board 5 is attached to the upper surface 4a side through the 2nd fixing tool 22 latched on the stop piece parts 17 and 17. FIG.
[0011]
The cross-sectional shape of the cross beam 4 shown in FIG. 8 (A) is a shape in which a pair of square C-shaped members (C-shaped channel members) are connected and integrated by connecting members 23 and have opening grooves 18 and 16 on the upper and lower sides. The second hooking piece portions 17 and 17 and the first hooking piece portions 15 and 15 are bent at right angles from the upper surface 4a and the lower surface 4b, respectively.
[0012]
The first fixing member 21 includes a cross-sectional hat-type (or gate-type) locking piece 21a which is hooked so as to cover the pair of left and right first hooking pieces 15 and 15 from above, and a hole in the hooking piece 21a. And a nut member 21b fixed to the latching piece 21a as a concentric part, and a bolt 21c inserted into the hole of the radio wave absorption panel 6 (not shown) and screwed to the nut member 21b.
The second fixing member 22 has a cross-section inverted hat-type (or inverted gate-type) locking piece 22a that is engaged with the pair of left and right second locking pieces 17 and 17 from below, and projects upward from the locking piece 22a. Bolt 22c and the like.
Therefore, as shown by arrows A and B in FIGS. 4 and 5 (described later), the scaffolding plate 5 and the radio wave absorbing panel 6 are attached and detachable while sliding in the longitudinal direction of the cross beam 4. .
[0013]
The cross-sectional shape of the cross beam 4 and the shapes of the first fixing tool 21 and the second fixing tool 22 can be freely changed in design, and may be configured as shown in FIGS. 8B and 8C. good. That is, in FIG. 8B, the latching pieces 21a and 22a are square or rectangular plate pieces, and on the other hand, the gap is slightly larger than the groove width of the first and second opening groove portions 16 and 18 of the transverse beam 4. The first and second latching piece portions 15, 15, 17, and 17 are provided so as to be (outside the width). Alternatively, in FIG. 8 (C), the latching pieces 21a and 22a have a roof-type cross-sectional shape composed of one central character portion and an inclined side portion that is inclined (folded) on the left and right sides. In the first opening groove portion 16 of the first embodiment, the first latching piece portions 15 and 15 are formed by bending upward and the second opening groove portion 18 is provided with the second latching piece portions 17 and 17 inclined downward. It is formed by bending.
[0014]
In short, it is only necessary that the scaffold plate 5 and the radio wave absorption panel 6 can be attached to the upper surface 4a and the lower surface 4b of the horizontal beam 4 from the horizontal lateral direction, either during the slide or after the attachment. However, the latching piece 21a of the first fixing tool 21 is securely engaged with the first latching piece portions 15 and 15 of the cross beam 4, so that the radio wave absorption panel 6 is always suspended. It is a structure which can hold | maintain, and the latching piece 22a of the 2nd fixing tool 22 engages reliably with the 2nd latching piece parts 17 and 17 of the cross beam 4, and the scaffold board 5 raises unexpectedly. It is a structure that can be prevented.
[0015]
In FIG. 7, the horizontal beam 4 and the radio wave absorption panel 6 are connected by a fall prevention wire 24 to prevent unexpected panel drop. As shown in FIG. 5, a hanging bracket 25 having an annular portion is provided in advance on the upper surface of the panel 6, and a fall prevention wire 24 is inserted into the annular portion of the hanging bracket 25 so that both ends of the wire 24 are connected. By sticking to the cross beam 4, the fall is prevented.
[0016]
Next, the mounting method (construction method) of the radio wave absorption panel 6 to the elevated back (girder back) 11 will be described. As shown in FIG. 1, the suspension member 2a is attached to the main girder 12 of the elevated back (girder back) 11. Install in a hanging shape.
Next, the vertical beam 3 is held in a suspended shape by the suspension member 2 a and in parallel below the main beam 12. Thereafter, the horizontal beam 4 is fixedly connected to the lower surface of the vertical beam 3 with a bolt or the like so as to be orthogonal in a plan view. A large number of cross beams 4 are arranged in parallel to each other in the left-right width direction of the road.
[0017]
Next, as shown in FIG. 4, a scaffold plate 5 made of a metal mesh body such as expanded metal is placed on the upper surface 4 a of the transverse beam 4 in a direction orthogonal to the transverse beam 4 in plan view, and the longitudinal direction of the transverse beam 4 as indicated by an arrow A. Install in order while sliding in the direction. At this time, although not shown in the figure, the second anchor 22 (described in FIG. 8) is attached to the scaffold plate 5, and the latching piece 22 a of the second anchor 22 is attached to the second anchor of the transverse beam 4. While being engaged with the piece 17, it is slid and attached in the direction of arrow A from the lateral direction.
[0018]
Next, as shown in FIG. 5, the radio wave absorption panels 6 are sequentially attached to the lower surface 4 b of the horizontal beam 4 while sliding in the longitudinal direction of the horizontal beam 4. The rectangular panel 6 is arranged in a direction orthogonal to the horizontal beam 4 in plan view, and the panel 6 is always held in a suspended shape by the first fixing tool 21 corresponding to the opening groove 16 in the lower surface 4b of the two or more horizontal beams 4. Slide while being.
[0019]
As shown in FIG. 5, when the upper scaffolding plate 5 is attached, the lower panel 6 is attached, and this is repeated in sequence, and the above two layers are formed on the entire surface of the elevated back 11. In addition, as shown in FIG. 6, the scaffold plate 5 group and the panel 6 group are arranged. Alternatively, a plurality of scaffolding plates 5 may be attached over a predetermined area, and then a plurality of panels 6 may be attached over the predetermined area. Alternatively, the scaffold plate 5 may be stretched over a sufficiently large area or the entire surface, and then the panel 6 may be stretched freely. Since the scaffold plate 5 is made of a metal mesh body, the panel 6 can be easily attached by inserting the work tool through the mesh and rotating the first fixing tool 21.
[0020]
Thereafter, as shown in FIG. 7, the fall prevention wire 24 prevents the panel 6 from being unexpectedly dropped. Further, the vertical beam 3 is fixed to the overhead road main girder 12 with a plate piece and bolts / nuts as the suspension member 2b. The hanging member 2a is left as it is or a part thereof is removed, and the panel mounting operation is completed.
[0021]
The present invention is configured as described above, and the scaffolding plate 5 is separated from the radio wave absorption panel 6 and is arranged in two layers on the top and bottom, so that the radio wave absorption panel 6 is installed while measuring the radio wave absorption characteristics. This eliminates the trouble of separately assembling or disassembling a conventional scaffold.
And since the scaffold board 5 is attached with the scaffold board 5, repair of the elevated back (girder back) 11 can be performed without waiting for the installation work of the radio wave panel 6.
[0022]
If the upper-layer scaffold plate 5 is a mesh body, the lower-layer radio wave absorption panel 6 can be attached / removed in units of one sheet through a jig (work tool) from the mesh. In addition, it is possible to repair the elevated back 11 (on the radio wave absorption panel 6). Further, it is not possible to step on the upper surface of the radio wave absorption panel 6 and damage it during the work. Moreover, since the scaffold board 5 and the radio wave absorption panel 6 can be slid along the horizontal beam 4 from the lateral direction (A and B directions), the work efficiency is improved, the construction period can be shortened, and the safety is high.
[0023]
Furthermore, since no scaffolding is required, there is no need to restrict the traffic of vehicles traveling back and forth as in the past. Then, there is an advantage that the maintenance (inspection / repair) of the back of the girders and the radio wave absorption panel 6 can be easily performed by walking on the scaffolding plate 5 at any time. Further, it is durable against vibration of the elevated road 10.
[0024]
【The invention's effect】
The present invention has the following remarkable effects by the above-described configuration .
The electric wave absorbing panel 6, while sliding along the cross beam 4, easily, and safely, and quickly, can be attached. Then, when attaching / removing the radio wave absorption panel 6 on the lower layer side and repairing work, it is possible to work easily and safely from above with a work tool or jig through the mesh of the scaffold plate 5. In addition, it is possible to easily attach / remove the radio wave absorption panel 6 in units of one sheet.
Thus, as a whole, the installation work of the radio wave absorption panel 6 and the installation work of the scaffold plate 5 can be performed in a short construction period.
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view showing a first attachment procedure according to an embodiment of the present invention.
FIG. 2 is an explanatory perspective view showing a second procedure.
FIG. 3 is an explanatory perspective view showing a third procedure.
FIG. 4 is an explanatory perspective view showing a fourth procedure.
FIG. 5 is a perspective explanatory view showing a fifth procedure.
FIG. 6 is an explanatory perspective view showing a sixth procedure.
FIG. 7 is a partially broken perspective view showing the seventh procedure and showing the embodiment of the mounting structure of the present invention.
FIG. 8 is a simplified explanatory diagram of main parts.
[Explanation of symbols]
4 transverse beam 4a upper surface 4b lower surface 5 scaffolding plate 6 radio wave (electromagnetic wave) absorption panel
11 Overpass (back of girders)
15 First hook piece
16 First opening groove
17 Second hooking piece
18 Second opening groove
21 First fastener
22 Second fastener

Claims (1)

  The lower beam (4b) side has a transverse beam (4) provided with a first opening groove (16) having a lower opening shape having first latching pieces (15) and (15) at both ends. Next, a scaffold plate (5) made of a metal mesh is attached to the upper surface (4a) of the transverse beam (4) while sliding in the longitudinal direction of the transverse beam (4). First fixing tools (21) are provided on the upper surface so as to project upward at a predetermined pitch, and the first opening grooves (16) of the lower surface (4b) of two or more transverse beams (4) are respectively connected to the first opening grooves (16). The electromagnetic wave absorbing panel (6) is slid in the longitudinal direction of the transverse beam (4) while hooking and holding the fixing tool (21), and a work tool or jig is moved from the metal mesh face. The electromagnetic wave absorbing panel (6) is inserted from top to bottom and rotated by rotating the first fixing tool (21) so as to be in contact with the lower surface (4b) of the transverse beam (4). A method of attaching a radio wave absorption panel, characterized by attaching

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