JP2002250014A - Sound insulating wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise reducing effect and excellent workability in constructing. SOLUTION: A recessed part 14 to be a rear air layer of a sound absorbing plate 20 is formed on an inner wall surface of a concrete wall 12. The recessed part 14 is provided on the whole of the inner wall surface and the recessed part 14 desirably has thickness of about 5 to 20 cm in the noise reducing effect. Plural lines of longitudinal ribs 16 and 16 are provided in the vertical direction on the inner wall surface of the concrete wall 12. The vertical ribs 16 and 16 have original purposes to hold strength of the thin concrete wall 12 and at the same time play roles of supporting the sound absorbing plate 20, securing the rear air layer on the wall surface of the concrete wall 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof wall installed on a side of an expressway or a railway elevated as a soundproofing measure of a vehicle.

[0002]

2. Description of the Related Art Conventionally, local noise barriers against noise sources, such as noise barriers along railway lines, road side noise barriers, and multi-story parking lots, have been constructed by installing a sound absorbing plate or a sound insulating plate on a concrete wall cast in place. Secured with clasps and built. At this time, in order to form an air layer between the sound absorbing plate (or the sound insulating plate) and the concrete wall, a spacing member is often interposed between the two. When such a soundproof wall is installed, for example, along a railway, a sound absorbing plate or the like occupies a limited inner space section, so that it is necessary to secure a space for installation in advance. In addition, there is a problem that the workability is poor because the spacing member, the fastener, and the like are required even in the case of mounting.

The inventors of the present invention have previously described a sound-absorbing panel in which a dam plate and a porous sound-absorbing plate are combined and integrated via an air layer.
A soundproof wall structure including a concrete wall in contact with the weir plate has been proposed (JP-A-2000-8331). The soundproofing wall according to the present invention uses the sound absorbing panel as a concrete driving formwork and uses the concrete wall as a sound insulating wall. It cannot be denied that advanced technology is required to satisfy construction accuracy during installation.

[0004]

SUMMARY OF THE INVENTION The present invention provides a soundproof wall in which a porous sound absorbing plate is attached to a precast concrete wall. The soundproof wall is excellent in noise reduction effect and workability in construction. It is intended to provide a wall.

[0005]

The sound-insulating wall of the present invention is a sound-insulating wall in which a porous sound-absorbing plate is attached opposite to a precast concrete wall made of fiber-reinforced concrete, and the concrete wall has vertical ribs. The problem is solved by having a concave portion as a back air layer. It is preferable that the sound absorbing plate is fixed by screwing a bolt into an insert previously embedded in the concrete wall via a shaped steel or a flat steel. It is preferable that a lower end of the concave portion covered with the sound absorbing plate is opened. The sound absorbing plate is preferably formed by curing an inorganic particulate matter and a fibrous filler that is added as necessary with a binder.

[0006]

A plurality of vertical ribs formed on the inner wall surface of the concrete wall reinforce the strength of the thin concrete wall and secure a back air space. Thus, the noise generated by the sound absorbing plate, the sound insulating concrete wall, and the air layer interposed therebetween is effectively reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as a preferred embodiment of the present invention, a soundproof wall installed on a road or a railway overpass will be described. FIG. 1 shows a soundproof wall 10 erected on an elevated foundation 8.
1 is a partial perspective view showing a soundproof wall 10 constructed by attaching a sound absorbing plate 20 to an inner wall surface of a concrete wall 12. The concrete walls 12, 12,... Are made of precast, are fixed to the elevated foundation 8 by anchor bolts 9, and are continuously erected to construct a side soundproof wall along a road or a railway elevated. Is done.

The concrete wall 12 is made of fiber reinforced concrete. In the present invention, fiber-reinforced concrete is used to improve the mechanical properties of cement concrete and reduce the weight of the member. Suitable fibers as the reinforcing material to be mixed include synthetic fibers such as vinylon fibers, aramid fibers, and polyethylene fibers, carbon fibers, and glass fibers. By using these reinforcing materials, the thickness of the precast concrete wall 12 can be reduced without using a rust-generating material.

[0009] On the inner wall surface of the concrete wall 12, a concave portion 14 which is an air layer behind the sound absorbing plate 20 is formed. It is preferable that the concave portion 14 is provided on the entire inner wall surface and has a thickness of about 5 to 20 cm from the viewpoint of a noise reduction effect. As shown in FIG. 2, a plurality of vertical ribs 16, 16 are provided on the inner wall surface of the concrete wall 12 in the vertical direction. The vertical ribs 16, 16 have the primary purpose of maintaining the strength of the thin concrete wall 12,
2 has a role of supporting the sound absorbing plate 20 while securing a back air layer on the wall surface. Therefore, the vertical ribs 16, 16
There are no restrictions on the shape and number of strips as long as these functions are satisfied.

The sound absorbing plate 20 of the present invention is made of a porous material having a continuous gap formed therein, and has a structure in which sound is easily absorbed. Inorganic granules are used as the main material of the sound-absorbing plate, and obsidian, pearlite, antifossil, foamed granules of natural stones such as shirasu, or foamed granules of glass or various ceramics are preferable, and these are used alone or in combination. Used. The particle size of the inorganic particles is preferably about 0.1 to 2 mm.

In the present invention, in order to increase the strength of the sound absorbing plate 20, it is desirable to mix a filler into the sound absorbing material to reinforce the strength of the sound absorbing plate. As the filler, chopped strand, mat, or net-like fibrous materials are preferable, and glass fibers, rock wool, inorganic fibrous materials such as carbon fibers, and organic synthetic fibrous materials such as vinylon and polyester. Can be used. Further, a prepreg formed by impregnating a fibrous material with a thermosetting resin such as a phenol resin, a polyester resin, an epoxy resin, or a melamine resin and semi-curing the fibrous material can also be suitably used. The portion to be reinforced with the filler may be at any position near or inside the surface of the sound absorbing plate, or may have any structure of a single layer, two or more layers.

The sound absorbing plate 20 is preferably formed by molding and hardening the inorganic particulate matter and the fibrous filler added as necessary with a binder. As a binder,
Either organic or inorganic binders can be used, but in the case of producing a sound absorbing material by adhering the inorganic particles in a spotted manner, a heat curing temperature in the range of 80 to 200 ° C. It is preferable to use a binder of a conductive resin. Examples of such a synthetic resin include a phenol resin, an epoxy resin, a melamine resin, a urea resin, and a lignin resin, and a phenol resin is particularly preferable. In the case of a phenolic resin, the mixing ratio with respect to the inorganic particulate matter is preferably 1.5 to 25% by weight, particularly preferably 5.0 to 15% by weight. If the amount is less than 1.5% by weight, the granular material cannot be firmly bonded to each other or the granular material and the filler, and the strength of the sound absorbing material decreases. On the other hand, if it exceeds 25% by weight, the voids between the granular materials are filled, and a porous structure suitable for a sound absorbing material cannot be formed.

In order to manufacture the sound absorbing plate 20, inorganic particulate matter,
The filler and the binder may be simply mixed, or the surface of the inorganic particulate matter may be coated in advance with a binder, and then the filler and a binder to be added as necessary may be mixed. Next, the mixture or the granular material is put in a mold or the like, and if necessary, a lubricant is mixed, and the mixture is heated and pressed to be formed by a dry manufacturing method. Of course, it may be manufactured by a wet manufacturing method. The porosity of the sound absorbing material obtained in this way is 5 to 75%, preferably about 10 to 50%.
The porosity can be adjusted by appropriately selecting the type and blending ratio of the inorganic particulate matter, the filler and the binder, or the production method such as the pressing pressure and temperature conditions.

Next, a method of attaching the sound absorbing plate 20 to the concrete wall 12 will be described with reference to FIG. Fig. 3 (1)
3 shows the state of attachment of the sound absorbing plate 20 in the vicinity of the connecting portion between the adjacent concrete walls 12, 12, and reference numeral 18 denotes a semi-cylindrical packing arranged at the connecting portion.
In the precast concrete wall 12, an insert 22 is preliminarily embedded at a manufacturing stage.
The sound absorbing plate 20 is screwed through the
On the concrete wall 12. In the present embodiment, a Z-section steel is used as the section steel 24, but such an attachment method is preferable as an attachment method on both the left and right sides and the lower side of the rectangular sound absorbing plate 20.

FIG. 3B is a cross-sectional view showing a state where the upper side of the sound absorbing plate 20 is attached to the top of the concrete wall 12, and the sound absorbing plate 20 is bolted by a chevron 24. FIG. 3 (3) shows a state in which two upper and lower sound absorbing plates 20 and 20 are simultaneously attached to the middle part of the concrete wall 12 in the vertical direction. Is fixed. When attaching the sound absorbing plate 20 to the concrete wall 12, the shaped steel 24 is used so that the shape and structure of the concrete wall 12 are not complicated.
Is preferably used, but if necessary, flat steel may be used. In any case, in the present invention, since the sound absorbing plate 20 is bolted to the concrete wall 12, maintenance work such as replacement is extremely easy. By sandwiching a cushioning material (not shown), for example, urethane foam tape having a thickness of about 5 mm, between the sound absorbing plate 20 and the concrete wall 12, the sound absorbing plate 20 generated by external force such as wind pressure can flutter. As much as possible.

As described above, when the sound absorbing plate 20 is bolted to the four sides of the concrete wall 12 and the vertical ribs 16, the concave portion 14 of the concrete wall 12 is covered with the sound absorbing plate 20, and a back air layer is formed. In FIG. 1, the lower end of the recess 14 is open. This is intended to promote drainage and ventilation of rainwater so that moisture and moisture do not adversely affect the durability and sound absorbing performance of the sound absorbing plate 20. In addition, by opening the lower end of the recess 14 by about several cm, it is possible to easily check the mounting bolts for the anchor bolts 9 of the concrete wall 12 which are required after the installation is completed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a viaduct 6 shown in FIG.
The sound reduction effect by the soundproof wall 10 was measured. The soundproof wall 10 is one in which the sound absorbing plate 20 is attached to the inner wall surface of the concrete wall 12 described above, and the noise level when the train passes at various train speeds is measured at a measurement point M outside the soundproof wall 10.
The results are shown in FIG. Also, for comparison,
The noise level was measured with only the concrete wall 12 from which the sound absorbing plate 20 was removed, and the results are indicated by the squares in FIG. From the results of both measurements, the noise level of the soundproof wall 10 to which the sound absorbing plate 20 was attached was reduced by 3 dB to 5 dB, and a noise reduction effect was recognized.

[0018]

According to the first aspect of the present invention, the soundproof wall has a concave portion and a vertical rib as a back air layer on the inner wall surface of the concrete wall, and the concrete wall is precast with fiber reinforced concrete. The concrete wall is integrated, and a lightweight and thin soundproof wall structure can be realized. In addition, since the construction can be performed without widening the entire construction space, the workability is excellent. Furthermore, since the soundproof wall surface has a smooth structure, it does not hinder traffic and work on the side of the wall, and by treating or painting the smooth surface, the scenery and beauty can be improved. Has side effects.

According to the soundproof wall of the second aspect, no extra hardware such as a spacer is required, and material costs and construction costs can be reduced. In addition, the sound absorbing plate can be easily mounted, and even if it is damaged, it can be easily replaced or the specification can be changed. In the soundproof wall according to the third aspect, due consideration is given to durability and sound absorbing performance of the sound absorbing plate, and maintenance work such as replacement can be performed extremely easily. According to the soundproof wall of the fourth aspect, the noise reduction effect is particularly remarkable.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a soundproof wall according to the present invention.

FIG. 2 is a front view of a precast concrete wall.

FIG. 3 is a cross-sectional view showing a state in which a sound absorbing plate is attached to a concrete wall.

FIG. 4 is a cross-sectional view of a viaduct in which a sound reduction effect of a soundproof wall is measured.

FIG. 5 is a graph showing a measurement result of a noise level in the example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Soundproof wall 12 Concrete wall 14 Depression 16 Vertical rib 20 Sound absorption plate 22 Insert 24 Shape steel 26 Bolt

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 596086549 Nissin Kosan Co., Ltd. 983-4 Nishibukuro, Yashio-shi, Saitama (72) Inventor Masanao Owaki 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Co., Ltd. In-house (72) Inventor Nobuyuki Murata 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Main office of Kumagaya Gumi Tokyo Co., Ltd. (72) Inventor Masaji Hata 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Headquarters of Kumagaya Gumi Tokyo Co., Ltd. 72) Inventor Hisayuki Komori 1-7-16 Kamidakaido, Suginami-ku, Tokyo Ozawa Concrete Industry Co., Ltd. (72) Inventor Toshiyuki Suzuki Nishigo, Shinagawa-ku, Tokyo 7-21-11 Sanda, New Nippon Thermal Engineering Co., Ltd. Tokyo Branch (72) Inventor Yoshiharu Ishikawa 983-4 Nishibukuro, Yashio-shi, Saitama Nisshin Steel Co., Ltd. F-term (reference) 2D001 AA01 AA05 BA01 BB01 CA01 CB02 CC01 CD02 CD04 2E001 DF02 DF04 FA03 FA30 GA14 GA42 GA84 HA05 HF15 5D061 AA13 AA16 AA22 AA29 BB21 BB24 BB35 BB37 DD03 DD04

Claims (4)

[Claims] 1. A sound-insulating wall having a porous sound-absorbing plate attached to a precast concrete wall made of fiber-reinforced concrete, the concrete wall having a vertical rib and a concave portion as an air layer behind. 2. The sound-insulating wall according to claim 1, wherein said sound-absorbing plate is fixed by screwing a bolt into an insert previously embedded in said concrete wall via a shaped steel or a flat steel. 3. The soundproof wall according to claim 1, wherein a lower end of the concave portion covered with the sound absorbing plate is opened. 4. The sound-insulating wall according to claim 1, wherein said sound-absorbing plate is formed by curing an inorganic particulate matter and a fibrous filler added as required with a binder.