JPH07180118A - Girder rear surface coating louver in elevated structure and louver panel - Google Patents

Abstract

PURPOSE:To make it possible to enhance absorption efficiency of noise and a sound absorption region, while inhibiting an increase in weight and a rise in cost. CONSTITUTION:A plurality of louver component members 6A are laid out in parallel with each other in such a fashion that they may form a sound absorption opening 8. The opening 8 is closed while a sound absorption material 10 is installed between the louver component members 6A. An air layer 11 is formed on the rear side of a girder 1a of an elevated structure 1, and what is more, it is mounted so that the rear side may be covered. The louver component members 6A are laid out in parallel so as to form the sound absorption opening 8. The opening 8 is closed while the sound absorption material 10 is installed between the louver component members 6A. A plurality of tie members are installed, crossing with the longitudinal direction of the louver component members 6A so as to tie up the louver component members respectively, thereby producing a panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a louver and a louver panel for covering the back surface of a girder in an elevated structure such as an elevated road or a railway.

[0002]

2. Description of the Related Art For example, when constructing an elevated expressway,
As shown in FIG. 11, there are cases where an elevated road 1 constructed via an abutment 3 is used as a general road 2 below the elevated road, or as a public facility such as a park or a parking lot.
By the way, if the girder back surface 1a of the elevated road 1 is exposed, there is a problem that the aesthetic appearance is impaired and there is a problem of pollution due to pigeon droppings, and noise from the car running on the general road 2 is reflected. There is.

In order to improve such problems of aesthetics and pigeon pollution, conventionally, louvers as shown in FIGS. 11 to 13 have been adopted. This louver 30 is made of metal such as iron, aluminum, titanium, etc., for example, a long hollow louver component member 30A formed in a wedge shape in cross section is attached to a beam member 31 suspended on the back surface 1a of an elevated road girder, and the width direction of the road. Is arranged in parallel with each other, and is bolted and fixed so that the clearance t between the louver constituent members 30A is 50 mm or less. This improves aesthetics and prevents pigeons from entering.

Further, since the louver component member 30A itself does not have a sound absorbing characteristic, as a measure against noise, conventionally, glass wool 32 is provided between the beam members 31 above the louver 30.
The sound absorbing material consisting of is laid to absorb noise from the general road 2 and prevent reverberation. In this case, in order to prevent the glass wool 32 from being blown up by the wind or the like, a styrofoam plate 33 for fixing is arranged between the upper side of the glass wool 32 and the grating 34 of the inspection corridor.

On the other hand, Japanese Utility Model Publication No. 4-99708 discloses that
It has been proposed that a louver body is filled with a sound absorbing material, and a sound absorbing opening is formed on the lower surface of the louver body to impart sound absorbing characteristics to the louver itself.

[0006]

However, in any of the conventional structures in which the sound absorbing material is laid on the beam member above the louver or the louver is filled with the sound absorbing material, the sound absorbing efficiency of the noise is low in all cases. There is a problem that the measures are insufficient, and improvement in this respect is requested.

Further, the louvers of the above-mentioned conventional publications have a problem that the louver opening width is narrower than the interval between the louvers due to its structure, the absorption characteristics in the low frequency range are low, and the absorption range is narrow. Here, in order to expand the absorption sound range, it is conceivable to increase the opening width of the louver. However, this makes the louver large and causes an increase in weight and a rise in material cost, so there is a limit.
In addition, it is possible to increase the aperture ratio by making the arrangement intervals of the louver constituent members close to each other.
There is a problem that the construction cost rises.

Further, in the conventional louver for covering the back surface of the girder, it is customary to attach a plurality of louver constituent members one by one to the receiving beam for attachment in the air, and then lay the sound absorbing material entirely on the prepared frame above the louver. As a result, the construction required a long period of time, and the traffic regulation period on the streets also became long. Further, it is necessary to provide a certain gap between the louver constituent members for absorbing sound, and there is an inconvenience that it is impossible to walk directly on the louver when inspecting each structural part.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to improve sound absorption efficiency and reliably take measures against noise, and avoid an increase in weight and an increase in cost. However, it is a first object of the present invention to provide a louver for covering the back surface of a girder in an elevated structure that can increase the sound absorbing aperture ratio and expand the sound absorbing range. Further, in addition to the above objects, a second object of the present invention is to provide a louver panel that can shorten the construction period and is advantageous for inspection after construction.

[0010]

The present invention is based on the above-mentioned first aspect.
In order to achieve the purpose of, the following technical measures are taken. That is, in the louver of the present invention according to claim 1, a plurality of louver constituting members 6A are arranged in parallel with each other to form the sound absorbing opening 8, and the opening 8 is closed to form the louver structure. A sound absorbing material 10 is provided between the members 6A, and an air layer 11 is formed between the sound absorbing material 10 and the girder back surface 1a of the elevated building 1 and is mounted so as to cover the back surface 1a. is there.

The louver of the present invention according to claim 2 is characterized in that a mounting portion 6c for the beam member 5 is provided on the upper portion of the louver component member 6A. Furthermore, in the louver panel of the present invention according to claim 3 for achieving the above-mentioned second object, a plurality of louver constituent members 6A are arranged so as to form the sound absorbing opening 8 in parallel with each other. The opening 8 is closed to provide a sound absorbing material 10 between the louver constituting members 6A, and a plurality of connecting members 18 are arranged so as to intersect with the longitudinal direction of the louver constituting members 6A. The member 18 is characterized in that the plurality of louver constituent members 6A are joined together to form a panel.

The louver panel of the present invention according to claim 4 is characterized in that the upper surface of the sound absorbing material 10 is reinforced by a frame body 21 formed of a perforated plate. Further, in the louver panel of the present invention according to claim 5, the louver panel 17 is connected to a plurality of mounting portions 19 with respect to the beam member 5.
The mounting part 19 is provided with a correction part 19A for the installation error of the louver panel 17, and an air layer 11 is formed between the mounting part 19 and the girder back surface 1a of the elevated building 1 via the mounting part 19. It is characterized by being mounted so as to cover the back surface 1a.

Further, the louver and the louver panel of the present invention according to claim 6 are characterized in that the width of the opening 8 is 30% or more of the mounting interval of the louver constituting member 6A.

[0014]

According to the covering louver 6 on the back surface of the girder in the elevated structure according to the present invention, the sound absorbing material 10 is arranged in the sound absorbing opening 8 between the louver constituent members 6A, and the upper portion of the sound absorbing material 10 is arranged. Since the air layer 11 is provided in the above, the sound passing through the opening 8 is a sound absorbing material.
It is absorbed when entering the inside of the girder 10, and is also absorbed when reversing at the back surface 1a of the girder and coming out of the sound absorbing material 10 again, so it is only necessary to lay or fill the conventional sound absorbing material. The sound absorption efficiency can be improved compared to the structure, and the noise countermeasure can be surely taken.

Further, since the sound absorbing openings 8 are provided between the louver constituent members 6A, the spacing between the louver constituent members 6A can be selected as compared with the conventional louver itself having the sound absorbing openings. The aperture ratio can be set arbitrarily, and while avoiding the problems of weight increase and material cost increase, it is possible to improve the sound absorption characteristics in the low frequency range, which has been limited in the past, and to expand the absorption range. Further, since the opening ratio is set to 30% or more, the sound absorbing efficiency can be improved also from this point.

Further, according to the louver 6 according to the present invention,
Since it is possible to arbitrarily set the arrangement position of the sound absorbing material 10 in the vertical direction between the louver component members 6A, it is possible to change the thickness of the air layer 11 by this,
The sound absorption efficiency and absorption frequency range can be further improved. Further, according to the louver panel 17 according to the present invention, the construction period is short, and when the elevated building is an elevated road, the traffic regulation period can be shortened.

Further, according to the louver panel 17 according to the present invention, since the frame body 21 made of a perforated plate is provided on the upper surface of the sound absorbing material 10, the sound absorbing material can be used for inspection after construction without lowering the sound absorbing efficiency. Can be a walkway. Further, according to the louver panel 17 according to the present invention, since the mounting portion 19 is provided with the correction portion 19A that corrects the installation error of the panel 17,
Improves workability when installing the panel 17 at the construction site,
It can be built accurately and firmly.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views for explaining a louver for covering the back surface of a girder in an elevated structure according to a first embodiment of the present invention. In this embodiment, the case of application to the above-described elevated expressway will be described as an example.

The elevated expressway to which this embodiment is applied is
As shown in Fig. 2, abutments 3 are erected at regular intervals on a general road 2, and the expressway 1 is placed between the abutments 3 via bridges 4 ... A beam member 5 is hung from each bridge 4 via a support member 5a.The beam member 5 extends in the road width direction of the highway 1 and is arranged at a predetermined interval in the traveling direction. There is.

On the lower surface of the beam member 15, a louver 6 characterizing the present embodiment is arranged. This louver
Reference numeral 6 denotes a plurality of louver constituent members 6A extending in the traveling direction of the expressway 1 and arranged in parallel in the road width direction at predetermined intervals. Also above expressway 1
A side cover 5b is provided between the right and left side girders 1a and the beam member 5 to prevent a pigeon from entering the girder 1a.

The louver constituent member 6A is made of unsaturated polyester, vinyl ester, which has flame retardancy and weather resistance.
Made of synthetic resin such as phenol, aluminum alloy, metal such as steel, or composite material of these,
In the embodiment, as shown in FIG. 1, a vertical wall made of FRP and having a generally king-shaped cross section has a height of 100 mm and a thickness of 5 mm.
An upper wall 6b having a width of 60 mm is integrally formed at the upper end of 6a, and the upper wall 6b
A receiving portion 6c, which is a concave groove in the longitudinal direction, is formed integrally therewith. A head of a mounting bolt 7 is fitted in the receiving portion 6c so as to be swingable in the longitudinal direction and non-rotatable, and the louver component member 6A is fastened to the beam member 5 by the bolt 7. Therefore, the receiving portion 6c is an attachment portion for the beam member 5.

At the lower end of the vertical wall 6a, a landscape lower wall 6d having a width of 100 mm is integrally formed. As shown in FIG. 2, the lower walls 6d are the lower walls when looking up from the sidewalk of the general road 2.
The 6d looks like a continuous surface, which improves the aesthetics. Furthermore, a support wall 6e having a width of 60 mm is integrally formed in the intermediate portion between the upper wall 6b and the lower wall 6d of the vertical wall 6a,
Due to the support wall 6e, the height between the louver component members 6A is increased.
Sound absorbing material divided into the upper part of 50 mm and the lower part of height 25 mm
Ten mounting parts are configured.

The space between the lower walls 6d of each louver component 6A is a sound absorbing opening 8, and the opening width y of this opening 8 is set to 100 mm which is the same dimension as the width x of the lower wall 6d. ing. As a result, the aperture ratio of the opening 8, that is, y /
(X + y) × 100% is set to 50%. The openings 8 between the louver constituent members 6A are closed with a sound absorbing material 10 made of glass wool, urethane foam, or metal material having open cells. In the illustrated embodiment, the opening
8 is a sound absorbing material 10 made of glass wool and extending in the longitudinal direction and having a thickness of 50 mm, and the sound absorbing material 10 is arranged so as to span between the support walls 6e of the louver constituent members 6A, and the support walls 6e and It is sandwiched by the upper wall 6b.

A back air layer is provided above the sound absorbing material 10.
11 is formed, and the thickness of this air layer 11 is the above-mentioned sound absorbing material.
The size is from the upper surface of 10 to the lower surface of the expressway girder 1a. When a scaffold plate for an inspection corridor (not shown) is laid on the upper end surface of the beam member 5, the thickness of the air layer 11 extends to the scaffold plate. Next, the function and effect of this embodiment will be described.

The louver 6 of the present embodiment is intended to improve the aesthetics of the undercarriage (back surface) 1a of the highway 1, prevent intrusion of pigeons, and prevent the car from traveling on the general road 2 at the back surface 1a of the girder. This is to prevent noise echo. In this case, the noise that has entered through the openings 8 between the louver constituent members 6A is absorbed when it enters the sound absorbing material 10, is further inverted at the back surface 1a of the girder, and passes through the sound absorbing material 10 from the air layer 11 again. It will be absorbed when going out.

As described above, according to this embodiment, since the air layer 11 is formed between the back surface 1a of the girder and the louver 6 is attached,
The noise from below is 2 when entering through the opening 8 and when exiting.
Since it is absorbed over time, the sound absorption efficiency can be improved and noise countermeasures can be taken reliably as compared with the structure of the conventional louver (Japanese Utility Model Laid-Open No. 4-99708). Further, the air layer 11 can be sufficiently secured in terms of its thickness and volume, and also from this point, the sound absorbing efficiency can be improved.

Further, a mounting portion 6c for the beam member 5 is provided on the upper part of each louver constituent member 6A, and the beam member 5 is arranged with a space therebetween by the mounting bolts 7 via the mounting portion 6c. Since the sound absorbing opening 8 is used and the opening ratio of the opening 8 is 50%, it is possible to significantly improve the low-frequency absorption sound range, which was difficult in the past, as is clear from the experimental examples described later. Moreover, the aperture ratio can be arbitrarily set only by appropriately setting the interval between the louver constituent members 6A, and the problems of increased weight and increased cost can be avoided. Here, it is desirable that the width y of the opening 8 is 150 mm or less, preferably 100 mm or less, in view of a pigeon in view of avoiding intrusion of a pigeon.

Further, in this embodiment, since the support wall 6e that can change the mounting position of the sound absorbing material 10 to the upper and lower stages is formed on the louver component member 6A, the thickness and volume of the air layer 11 or the thickness of the sound absorbing material can be changed. It is possible to set the absorption frequency band corresponding to the installation place, environment, etc. while improving the sound absorption efficiency, and the applications can be expanded accordingly.

FIG. 3 shows the result of an experiment conducted to confirm the effect of the louver 6 according to the present invention. In the figure, the curve A is a louver filled with a sound absorbing material, and the opening ratio of the louver is 20%.
It is the sound absorption coefficient in the case of the above-mentioned conventional publication, which is set to -25%. Curve B is a comparative example in which the louver is filled with a sound absorbing material and an air layer having a thickness of 25 mm is formed between the sound absorbing material and the inner wall of the louver, and the opening ratio of the louver is 50%. Is the sound absorption coefficient of. A curve C is the sound absorption coefficient when the thickness of the air layer of the structure of this embodiment is 2500 mm. The curve D
Is the ideal sound absorption coefficient.

As is clear from FIG. 3, in the conventional structure (curve A) in which the louver is filled with the sound absorbing material, the sound absorption coefficient is low over almost the entire frequency range, and the noise countermeasure is insufficient. On the other hand, an air layer is formed in the louver to increase the aperture ratio to 50.
In the case of the comparative example structure (curve B) in which the ratio is set to%, the sound absorption coefficient is improved as compared with the conventional structure, but the sound absorption coefficient in the low frequency region is low. On the other hand, in the case of the structure of this embodiment (curve C), the sound absorption coefficient is improved over substantially the entire frequency range,
It can be seen that it is close to the ideal sound absorption coefficient (curve D).

4 and 5 show the louver of the present invention.
Sixth second and third embodiments will be shown. In the second embodiment of FIG. 4, the louver component 15 has a pair of vertical walls 15a, 15a extending in the longitudinal direction formed in parallel with each other, and an upper wall 15b is provided outside each vertical wall 15a.
This is an example in which a lower wall 15d and a support wall 15e are provided, and a pair of vertical walls 15a are connected by a mounting portion 15f to be integrally formed. In addition, the louver component 16 in FIG.
This is an example of forming a hollow cross-sectional shape with A. By having such a hollow cross-sectional shape, it is possible to make it lighter in weight and stronger in twisting than a solid cross section. Further, by forming the flat surface 16B and the curved portion 16C as shown in the drawing, the flat surface 16B appears to be a substantially continuous surface as shown in FIG. 2, and when viewed from directly below,
The curved portion 16C can give a soft feeling.

6 to 10 show an embodiment of the louver panel 17 according to the present invention. The panel 17 according to the first embodiment shown in FIGS. 6 to 8 includes a plurality of louver constituent members 16 having the hollow cross-sectional structure shown in FIG. 5 in parallel with each other to form the sound absorbing opening 8. The sound absorbing member 10 is provided between the louver constituting members 16 by closing the opening 8 and the plurality of connecting members 18 are provided so as to intersect the longitudinal direction of the louver constituting members 16. A panel is formed as shown in FIG. 6 by joining the connecting member 18 to the mounting portions 16A of the plurality of louver constituting members 16 with a slide bolt V or the like at a factory or the like.

The connecting member 18 is the first connecting member 18 exemplified by the angle steel located on the line of the beam receiving member 5.
It is composed of a second connecting member 18B exemplified by a flat bar made of FRP or metal, which is arranged between A and the member 18A, and has three-dimensional directions at both ends of the first connecting member 18A as shown in FIG. The adjustable mounting 19 is provided on the
In addition, it has a correction unit 19A capable of absorbing the installation error.

That is, the louver panel 17 has an air layer 11 between itself and the back surface of the girder, and is attached to the plate girder 20 via the mounting part 19 so that the correction part 19A can absorb the installation error in the three-dimensional direction. Is. The mounting portion 19 is composed of a bracket metal piece 19B, and the correction portion 19A is composed of a horizontal elongated hole 19C, a vertical elongated hole 19D, and bolts 19E which are fastened by being inserted through these.

Further, a box-shaped frame 21 made of a perforated plate is fitted on the sound absorbing material 10 arranged so as to close the opening 8 to reinforce the sound absorbing material 10. When the louver panel 17 is attached by forming the air layer 11 on the back surface of the girder of the elevated building by the mounting portion 19, the frame 21 serves as a corridor for inspection and the like. 9 and 10 show a second embodiment of the louver panel 17, in which the opening 8 of the louver component 6 having the structure already described with reference to FIG. 1 is closed by the sound absorbing material 10, and the connecting member 18 is used. The slide bolts V are fastened to the mounting portion 6C of the member 6 so as to be joined to each other to form a panel. The louver panel 17 of the second embodiment.
Also, the air layer 11 is formed between the back surface 1a of the girder and the attachment portion 19 having the correction portion, and is attached.

Further, in the first and second embodiments of the louver panel 17, the louver constituent members 6 and 16 can be made of unsaturated polyester, vinyl ester, synthetic resin such as phenol or aluminum alloy, metal material such as steel, Sound absorbing material
10 can be made of glass wool or the like, and the opening width Y is set to 30% or more, preferably 50% or more of the mounting interval (X + Y).

Further, the louver panel 17 of the first and second embodiments.
It is desirable to attach blind lids 17A shown in FIGS. 6 and 9 to both ends of the. Further, in the above-mentioned embodiment, the louver or louver panel of the elevated expressway is described as an example, but the present invention is widely applicable to elevated railways, bridges, or elevated structures such as station yard and factory. .

Further, the louver constituent members 6, 15 and 16 may have any design, shape, etc. as long as they can hold the sound absorbing material. In addition, the louver components 6,15,16, the sound absorbing material 10,
The frame body 21 can be colored by painting or the like to improve the landscape.When the frame body 21 is used as a walkway, the height of the air layer 11 is used as a painting workbench after installation (erection). Is sufficiently secured, which is advantageous.

Further, the frame 21 may be a perforated plate, such as a damping steel plate having a large number of holes, an extension metal, a hard resin plate having a large number of holes, and a sandwich structure material thereof. Good. Further, the size of the louver panel 17 according to the embodiment of the present invention is produced at the factory according to the back surface of the building, and it is advantageous that the panel can be transported from the factory to the site.

[0040]

As described above in detail, according to the louver of the present invention, the sound absorption efficiency can be improved and the absorption sound range can be expanded while avoiding the increase of the weight and the increase of the cost, and the noise countermeasure can be surely taken. effective. Further, according to the louver panel according to the present invention, in addition to the above-described operational effects, the on-site construction period can be shortened for mounting, the mounting can be performed accurately and robustly, and the working space for inspection after mounting can be increased. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a louver according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a general elevated expressway to which the louver of the above embodiment is applied.

FIG. 3 is a frequency-sound absorption coefficient characteristic diagram showing an experimental result of the above-mentioned embodiment.

FIG. 4 is a cross-sectional view showing a louver according to a second embodiment.

FIG. 5 is a cross-sectional view showing a louver according to a third embodiment.

FIG. 6 is a perspective view of a louver panel according to a first embodiment of the present invention.

FIG. 7 is a cross-sectional view of a main part of the louver panel of the above embodiment.

FIG. 8 is a perspective view of a main part showing a mounted state of the louver panel of the above embodiment.

FIG. 9 is a perspective view of a louver panel according to a second embodiment of the present invention.

FIG. 10 is a transverse cross-sectional view of the louver panel of the above embodiment.

FIG. 11 is a schematic view of an elevated road to which a conventional louver is applied.

FIG. 12 is a cross-sectional view showing a conventional louver.

FIG. 13 is a vertical sectional view showing a conventional louver.

[Explanation of symbols] 1 Expressway (elevated structure) 1a Back side of girder 6,15 Louver 8 Sound absorbing opening 10 Sound absorbing material 11 Air layer 17 Louver panel 19 Mounting part

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Toshio Yoshimura 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture Kobe Steel Research Institute, Kobe Research Institute (72) Inventor Saburo Chuo-ku, Kobe-shi, Hyogo 1-3-18 Wakihamacho Stock Company Kido Kogyo, Kobe Head Office (72) Inventor, Oya Katsura 1-3-18 Wakihamacho Chuo-ku, Kobe City, Hyogo Prefecture Stock Company Door Kogyo (72) Invention Person Yasuhiro Oki 1-3-18, Wakihamacho, Chuo-ku, Kobe, Hyogo Stock Company Ato Steel Works Kobe Head Office (72) Inventor Ryuichiro Kato 1-3-18, Wakihama-cho, Chuo-ku, Kobe City, Hyogo Tokobe Head Office

Claims (6)

[Claims] 1. A plurality of louver constituting members (6A) are arranged in parallel with each other so as to form a sound absorbing opening (8), and the opening (8) is closed to close the louver constituting member (6). 6A) is provided with a sound absorbing material (10) and an air layer (11) is formed between the sound absorbing material (10) and the back surface (1a) of the elevated structure (1) and the back surface (1a)
A louver for covering the back side of a girder in an elevated structure, which is mounted so as to cover the girder. 2. A beam member is provided on the upper part of the louver component member (6A).
The louver for covering the back side of the girder in an elevated building according to claim 1, further comprising a mounting portion (6c) for the (5). 3. A plurality of louver constituting members (6A) are arranged in parallel with each other to form a sound absorbing opening (8), and the opening (8) is closed to close the louver constituting member (6). 6A) is provided with a sound absorbing material (10), and a plurality of connecting members (18) are arranged so as to intersect the longitudinal direction of the louver constituent member (6A), and the connecting member (18) A louver panel for covering the back side of a girder in an elevated structure, wherein a plurality of louver constituent members (6A) are joined together to form a panel. 4. A frame body having a perforated plate on the upper surface of the sound absorbing material (10).
The louver panel for covering the back side of the girder in an elevated structure according to claim 3, wherein the louver panel is reinforced by (21). 5. A louver panel (17) is provided on a connecting member (18) with a plurality of mounting portions (19) for a beam member (5), and the mounting portions (19) prevent the installation error of the louver panel (17). Correction unit
(19A), and an elevated structure through the mounting portion (19).
The elevated construction according to claim 3 or 4, characterized in that an air layer (11) is formed between the back side (1a) of the girder and the back side (1a) is covered. Louver panel for covering the back side of girders in objects. 6. A louver component member (6A) having a width of the opening (8).
The louver for covering the back surface of the girder and the louver panel in the elevated structure according to claim 1 or 3, characterized in that the mounting interval is 30% or more.