JPH10280334A - Sound absorbing member to be used to scaffold and combinely as sound absorbing system at rear surface side of elevated road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the noise absorbing performance by housing a hollow sound absorbing material in an empty place surrounded by beam materials, scaffolding boards and exterior finishing materials and by securing gaps by projected portions with the size suited to the sound absorption between a sound absorbing material and an exterior finishing material. SOLUTION: Beam materials 10, 10 are arranged at both the corner positions of lateral cross section of a sound absorbing member 2, a beam material 11 is arranged at the central section, scaffold board 12 is arranged between the beam materials 10, 10. End portions at both sides of the exterior finish board 14 are attached to the lower portion of the beam material 10, and sound absorbing materials 15, 16, 17 formed by laminating and adhering inorganic fiber sheet are housed in an empty space surrounded by the beam materials 10, 11, scaffolding board 12 and exterior finish board 14. Then, the sound absorbing material 15 is formed to an hollow construction and a gap G having the size suited to the sound absorption with the exterior finish material 14 is secured by the projection 18. The sound absorbing member 2 is attached and laid between the small beams suspended from the main girder at the rear side of the elevated road. Thus, reflected sound from the rear surface of the elevated road and also noise transmitted from a traveling vehicle on the elevated road to the rear surface side is also absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scaffold that also serves as a scaffold and is used to reduce noise generated by an automobile or the like transmitted to the back side of an elevated road or an elevated railway (hereinafter, simply referred to as an elevated road). The present invention relates to a sound absorbing member used in a sound absorbing system, which belongs to the technical field of a system.

[0002]

2. Description of the Related Art Conventionally, hanging scaffolds (working scaffolds) for painting a main girder, inspecting and repairing various structural parts, and the like have been provided on the back side of an elevated road. On the other hand, in view of the recent emphasis on environmental and landscape protection and the fact that reducing the level of traffic noise in cities has become a major social problem, the development of a sound absorption system that also serves as the scaffold, Development of a system for improvement is underway. At present, as a sound absorbing system on the backside of an elevated road and a sound absorbing member used in the sound absorbing system, the following technologies are scattered. Japanese Patent Application Laid-Open No. 49-85828 discloses a sound absorbing system having a configuration in which a plurality of planar sound absorbing members hanging down from near the underside of an elevated road are arranged, and a flat case formed of a porous aluminum alloy plate. A sound absorbing member filled with a sound absorbing material made of glass fiber is disclosed. Japanese Patent Application Laid-Open No. 4-174109 discloses that a plurality of cylindrical sound-absorbing tubes are horizontally and horizontally arranged at intervals of 0.5 to 2 times the diameter of a supporting frame suspended on the back side of an elevated road. A sound absorbing system having a diameter of 5 mm and a sound absorbing plate formed by compression molding with a metal fiber mat sandwiched between a perforated plate or a mesh.
A sound-absorbing cylinder is disclosed which is formed into a cylindrical shape of 0 mm to 500 mm, and has a structure in which a supporting middle pillar traversing the inside of the hollow portion in the diameter direction is axially penetrated and fixed. In Japanese Utility Model Publication No. 5-2646, a long columnar sound absorbing member is provided on the underside of an elevated road with a slight space between them.
Moreover, a sound absorbing system having a configuration in which a plurality of metal fibers such as aluminum fibers and the like are sandwiched by a wire mesh in a groove shape, and a sound absorbing system having a configuration in which a plurality of the fibers are arranged side by side in parallel with a required interval also from the back of the road, There is disclosed a hollow columnar sound absorbing member which is formed in a V shape or a semicircular shape which is convex downward and whose upper surface opening is closed by a flat sound insulating material. The applicant of the present application has proposed a sound absorbing system for a scaffold on the back side of an elevated road and a sound absorbing member used for the same in the specification and drawings of Japanese Patent Application No. 8-214452.

[0003]

[Problems to be solved by the present invention]

(1) In the case of the invention described in Japanese Patent Application Laid-Open No. 49-85828, since the flat sound absorbing members are juxtaposed in a hanging state, the noise of a vehicle traveling on a road below is absorbed. The effect has directionality and it is difficult to expect a multi-faceted sound absorbing effect. In addition, the noise easily passes through the sound absorbing members arranged side by side in a hanging state, and reaches the rear surface of the elevated road above and is reflected.This reflected sound and traveling vehicles on the elevated road are generated. It is not configured to actively capture and absorb noise transmitted to the back side, and difficulties are recognized in the sound absorbing effect.
In addition, it is considered that the structure and the construction method in which a plurality of the sound absorbing members are juxtaposed in a hanging state are considered to be practically difficult, and it is recognized that the sound absorbing member is not constituted as a scaffold. (2) The invention described in the above-mentioned Japanese Patent Application Laid-Open No. 4-174109 discloses a cylindrical sound absorbing cylinder having a diameter of 0.5 to 2 mm.
The noise is easy to pass between the sound absorbing members because it is arranged side by side at double the distance, and the noise reaches the back of the elevated road above and is reflected. The vehicle is not configured to actively capture and absorb noise generated by the vehicle and transmitted to the rear side, so that difficulty is recognized in the sound absorbing effect. In addition, it is recognized that a cylindrical sound absorbing cylinder does not at all have a structure that also serves as a scaffold. (3) The invention described in Japanese Utility Model Publication No. 5-2646 discloses a hollow structure in which a sound absorbing material in which metal fibers are sandwiched between wire meshes is formed into a semicircle or the like, and the upper opening is closed by a sound insulating plate. Although a sound absorbing member having a structure is used, it is difficult to achieve a sufficient sound absorbing effect because the wall thickness of the sound absorbing member is thin. In particular, since it is not configured to absorb the reflected sound from the backside of the elevated road and the noise generated by the traveling vehicle on the elevated road and transmitted to the backside, it is considered that the noise reduction effect is difficult. (4) The purpose of the invention is to further improve the above-mentioned prior application invention,
It is lighter and cheaper, and has excellent sound absorption performance of the reflected sound on the backside of the elevated road and the noise generated by traveling vehicles on the elevated road and transmitted to the backside, and installation is easy,
Moreover, it is an object of the present invention to provide a sound-absorbing member that can be used as a scaffold and has high safety.

[0004]

As a means for solving the above-mentioned problems, a sound-absorbing member used for a scaffold / sound-absorbing system on the backside of an elevated road according to the present invention is provided at both ends in the longitudinal direction. A notched groove with an opening width in which a flange of a suspended small beam is fitted on the back side of an elevated road or the like, and extends over the entire length in the longitudinal direction at at least both corner positions of the upper part in the cross section A beam member having a length is arranged in an inward channel steel shape, and a scaffold plate made of a perforated plate is installed between the upper surfaces of the beam members. Both ends of the exterior plate molded into are attached, and in the space surrounded by the beam material, the scaffold plate and the exterior plate,
A sound absorbing material formed by laminating and bonding inorganic fiber materials to form a hollow structure is stored, and a gap of a size suitable for sound absorption between the sound absorbing material and the exterior material is secured by the convex portion. , Respectively.

[0005] A second aspect of the present invention is characterized in that the beam member according to the first aspect and the scaffold plate formed of a perforated plate provided between the upper surfaces thereof are integrally extruded. . According to a third aspect of the present invention, a sound-absorbing material protective film is disposed on the inner surface of an exterior material for housing the sound-absorbing material, and a convex portion provided on the outer peripheral surface of the sound absorbing material is provided between the sound absorbing material protecting film and the sound absorbing material. A gap having a size suitable for sound absorption is secured.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A sound absorbing member according to the present invention is not shown in detail in a scaffold / sound absorbing system,
As shown in FIG. 2, the beam is horizontally laid as shown in FIG. 2 between the small beams 1, 1 suspended from a main girder or the like on the underside of the elevated road. For this reason, the beam 1 is typically made of an H-beam or the like, and is installed substantially horizontally in the road width direction of the elevated road with an interval equal to the longitudinal length of the sound absorbing member 2 (typically about 2 m).

On the other hand, as shown in FIGS. 2 and 3, the sound absorbing member 4 has a notch-shaped groove 3 having an opening width in which the flange 1a of the small beam 1 is fitted at both end surfaces in the longitudinal direction. Is provided. By fitting the concave groove 3 into the flange 1a of the small beam 1, each sound absorbing member 4 can be laid relatively easily and reliably on the back side of the road in a stable state. That is, bolt-less mounting is performed without using bolts and nuts, which are likely to be loosened due to vibration and are easy to perform, and work efficiency is high. At both ends of the beam 1 in the longitudinal direction, the sound absorbing member 2 is positioned and fixed so as not to fall off in the longitudinal direction. Is performed.
A cushion material 4 made of foamed plastic or the like is adhered to the upper surface of the concave groove 3 so as to prevent the occurrence of metal noise due to non-slip and small vibration when attached to the small beam 1. Reference numeral 5 in FIG. 3 denotes an eyebolt prepared for suspending the sound absorbing member 2.

[0008] At least one side surface of the sound absorbing member 2
As shown in FIG. 4, a gap sealing material 6 made of foam rubber and having a thickness of about 10 mm is attached. This is because the gap sealing material 6 is tightly attached to the side surface of the adjacent sound absorbing member 2 to fill the gap when laid on the small beams 1 as described above, thereby blocking noise coming from below. In FIG. 4, a rib 7 protruding immediately below the gap sealing material 6 is
This is a means for defining the effective width of laying the sound absorbing member 2 by complementing the elasticity of the sound absorbing member 2.

Next, the actual configuration of the sound absorbing member 2 will be described. In the cross section of the sound absorbing member 2 shown in FIG. 4, beam members 10, 10 having a length extending over the entire length in the longitudinal direction of the sound absorbing member 2 are provided at at least upper and lower right and left corner positions. It is arranged in a steel shape. Accordingly, regarding the beam member 10, the invention of the prior application (Japanese Patent Application No. H8-209,199), which was formed in the shape of a square pipe, was used.
-214452). Further, another beam member 11 is disposed at the center, and a scaffold plate 12 made of a perforated plate is provided between the upper surfaces of the beam members 10 and 11. Thus, the strength and rigidity required as a scaffolding material is ensured, and the width 290 is set so as to be suitable for human walking.
A flat walking surface of about mm is formed. In the case of FIG.
As the beam members 10 and 11 and the scaffold plate 12, a molded product obtained by integrally extruding lightweight aluminum to an average plate thickness of about 2 mm is used. Further, in the portion of the scaffold plate 12, as shown in FIG. 1, holes 13 having a diameter of about 16 are intensively punched to form a perforated plate having an aperture ratio of about 25%. It is configured to be able to absorb the sound and the noise generated by the traveling vehicle on the elevated road and transmitted to the back side.

Below the beam members 10 and 10 at the left and right corners, a stainless steel expanded metal having a plate thickness of 0.6 mm, an aperture ratio of about 70%, and a small unit weight is formed in a downward semi-circular shape. Both end portions of the exterior plate 14 formed into a (or U-shaped) are attached by means such as rivets or tapping screws. The reason why the exterior plate 14 is formed into a downward semicircular shape is to efficiently absorb noise rising from a lower road from multiple or multiple sides.

Thus, the above-mentioned beam members 10 and 11 and scaffold plate 1
A sound absorbing material 15, 16, 17 formed by laminating and bonding a number of inorganic fiber material sheets such as glass wool is housed in a space surrounded by the outer plate 2 and the exterior plate 14. The sound absorbing members 15, 16, 17 are integrated by bonding their contact surfaces to each other. In particular, the sound absorbing material 15 is formed into a hollow structure having an outer diameter of about 170 mm and an inner diameter of about 70 mm, thereby reducing the weight without deteriorating the sound absorbing effect. This is because even in the case of a hollow structure, the sound that reaches the hollow portion is diffusely reflected and absorbed. Further, a gap G of a size suitable for the sound absorbing action (generally about several mm) is provided over substantially the entire circumference of the sound absorbing material 15 between the hollow sound absorbing material 15 and the exterior material 14. The fact that the existence of the gap G exerts an excellent sound absorbing effect is described, for example, in the September 1995 1995 Japanese Noise Control Engineering Society Technical Presentation Lecture Paper (P31).
7 and below, paragraphs 2-3-15).

In the case of the present invention, as a means for structurally securing the gap G, as shown in FIG. 5, a ridge 18 continuous in the axial direction is provided on the outer peripheral surface of the sound absorbing material 15, or FIG. As illustrated, the protrusions 18 that are sparse in the circumferential direction and the axial direction, and the protrusions 18 that are provided as the protrusions 18 that protrude in a flange shape in the circumferential direction as illustrated in FIG. First, a film protection material 20 such as a glass cloth is provided on the inner surface of the exterior material 14 for housing the sound absorbing material 15.
The sound absorbing material protection film 21 is disposed inside the sound absorbing material to prevent the sound absorbing material 15 from being stained with dust or rainwater. The sound absorbing material protection film 21 and the sound absorbing material 15
A gap G is secured by the convex portion 18 between the outer peripheral surface and the outer peripheral surface. In particular, the sound absorbing material protective film 21 is configured to maintain the gap G in an appropriately loosened state to maintain the sound absorbing effect.

However, the projection 18 can be provided on the sound absorbing material protective film 21 side. The protrusions 18 can be used as independent spacing members. Each of the sound absorbing members 16 and 17 having a flat plate shape at the top is formed by laminating a plurality of inorganic fiber material sheets flat and bonding them, and compression-molding them into a thick plate shape. Two sound absorbing materials 1 located on the left and right of the top
In gaps 7 and 17, gaps G required for the sound absorbing effect are secured between the beam members 10 at both corners, between the beam members 11 at the center portion, and the scaffold plate 12, respectively. On the lower surface of the scaffolding plate 12, left and right hook-shaped support portions 22 are provided.
The upper film protection member 23 such as a stainless steel mesh is provided by utilizing the above.

The weight of the sound absorbing member 2 of the present invention thus constructed is reduced to about 12 kg so that it can be easily carried by hand or laid on site.

[0015]

The sound-absorbing member according to the present invention is used in a sound-absorbing system for a scaffold on the backside of an elevated road, as a structure that also serves as a scaffolding plate, and that constitutes a design that does not impair the cityscape. It not only absorbs noise coming from below the elevated road, but also positively absorbs the reflected sound from the underside of the elevated road and the noise generated by traveling vehicles on the elevated road and transmitted to the underside. Therefore, while conforming to the concept of emphasizing the cityscape, it exhibits excellent sound absorption performance (average sound absorption rate is 90% or more), and also functions as a scaffold, contributing to environmental conservation by reducing road traffic noise.

Moreover, a boltless construction method can be adopted for the installation of the sound absorbing member, which eliminates the problem of loosening of the bolt, and has the advantage that the operation can be performed with simpler work because of the reduced cost and weight.

[Brief description of the drawings]

FIG. 1 is a plan view showing a sound absorbing member according to the present invention.

FIG. 2 is a front view showing the sound absorbing member in relation to small beams.

FIG. 3 is an enlarged front view of a right end portion of the sound absorbing member.

FIG. 4 is a cross-sectional view of the sound absorbing member.

FIG. 5 is an external perspective view of the sound absorbing material.

FIG. 6 is an external perspective view of different sound absorbing materials.

FIG. 7 is an external perspective view of different sound absorbing materials.

[Explanation of symbols]

 Reference Signs List 2 sound absorbing member 1 small beam 1a flange 3 concave groove 10 beam material 12 scaffolding board 14 exterior material 15 sound absorbing material 16 sound absorbing material 17 sound absorbing material G gap 18 convex portion 21 sound absorbing material protective film

Claims (3)

[Claims] 1. A sound-absorbing member used for a scaffold / sound-absorbing system on the back side of an elevated road or the like, wherein an opening width in which flanges of small beams suspended on the back side of an elevated road or the like are fitted at both longitudinal ends. A notch-shaped concave groove is provided, and a beam material having a length extending over the entire length in the longitudinal direction is arranged in an inward channel steel shape at least at both corner positions of the upper part in the cross section,
A scaffold plate made of a perforated plate is installed between the upper surfaces of the beam members, and both end portions of an exterior plate formed by molding a perforated plate into a downward substantially semicircular shape are attached to a lower portion of the beam member, and the beam member and A sound absorbing material formed by laminating and bonding inorganic fiber materials to form a hollow structure is accommodated in a space surrounded by the scaffold plate and the exterior plate, and a sound absorbing material is provided between the sound absorbing material and the exterior material. A sound-absorbing member used for a scaffold / sound-absorbing system on the backside of an elevated road, wherein a gap of a suitable size is secured by a convex portion. 2. A sound absorbing member, wherein the beam member according to claim 1 and a scaffold plate made of a perforated plate provided between upper surfaces thereof are integrally extruded and formed. 3. A sound-absorbing material protective film is disposed on an inner surface of an exterior material for accommodating the sound-absorbing material, and between the sound-absorbing material protecting film and the sound absorbing material, a convex portion provided on an outer peripheral surface of the sound absorbing material is suitable for sound absorption. The sound absorbing member according to claim 1, wherein a gap having a size is secured.