JPH0776959A - Screen body - Google Patents

Abstract

PURPOSE:To suppress the generation of a wind breaking sound by forming the top end of a screen material to be mounted with a space into a circular cross section, applying a seal member thereto, and providing a roundness by covering the top end edge with a long cap or the like. CONSTITUTION:Screen members 4 are mounted on a base frame 3, and on the screen surfaces formed on the respective surfaces, the air flow passing to the inside of a screen body 2 is guided to round top end surfaces 9 on the screen body 4 top ends. The air flow is smoothly passed through the space between the screen members 4, and the swirling is minimized to prevent the vibration of the air between the members 4, or the air flow is weakened to suppress the generation of a wind breaking sound. At that time, the upper surface 7 and lower surface 8 on the top end part of each screen member 4 are formed in parallel to each other, the flow of the air is more smoothed to further suppress the wind breaking sound. A damping member 11 is stuck to the screen member 4, whereby the member 4 is resonated with the vibration of the air between the members 4 so that the enlargement of the sound can be prevented. The top end edge of the screen member 4 is formed round by depositing the seal member or applying a resin cap thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen body that can be used for blinding rooftop equipment of a building or equipment attached to the building or as a fence.

[0002]

2. Description of the Related Art Since an elevator ridge on the roof of a building, a cooling tower, an external staircase attached to the building, a storage room, etc. often impair the appearance of the entire building, they are blindfolded by a screen body. Moreover, such a screen body may be used as a handrail or a fence of a pedestrian bridge or an viaduct.

Some screen bodies form a screen surface by arranging screen materials at intervals. Such a screen body is often used because the appearance created by a large number of screen materials arranged at intervals is smart and the circulation of outside air is good.

However, if the screen surface on which a large number of screen materials are attached at intervals is a place where the wind is strong, a loud wind noise may be emitted, which may cause annoyance to the surrounding people. In addition, the strength of the wind changes due to the formation of buildings in the surroundings, and wind noise that has not occurred until now may suddenly start. As an example, Fig. 4 (a) and (b) show the results of noise levels measured at various wind speeds by installing a screen body in which clean materials are arranged laterally and at intervals above and below the rooftop of a building. is there. Human audible range is 20 ~
The band near the 2000 Hz is the texture. 800 ~
The peak seen near 1600 Hz is the wind noise caused by this screen body. It is about 50 phons in size, and it stands out from the surrounding sounds.

In a wind tunnel experiment or the like, when the movement of the air flow (wind) with respect to one screen surface of the screen body in which the screen material having the same shape is laterally and vertically spaced apart is examined, As shown in FIG. 7, it can be seen that when there is a certain level of strength, there is a regular airflow that moves along the outer surface of the screen and an airflow that separates from it and forms a vortex that enters the gap of the screen material. The generation of wind noise is related to the strength and direction of the wind, the spacing between screen materials, the air flow path between the shapes, and the mechanism of generation is complicated. However, from the state of the wind tunnel experiment, it is considered that the strong vortices formed between the screen materials vibrate the air between the shape members and that the vibration causes the screen material to resonate.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a screen body capable of suppressing the generation of wind noise.

[0007]

[Means for Solving the Problems] Screen members are attached at intervals to form a screen body. The front edge of the screen material is formed to have a round cross section. It is preferable to have the following configuration. In the cross section of the screen material, the upper surface and the lower surface of the tip end portion are formed parallel to each other, and the tip end edge is formed round in the cross sectional shape.

[0008]

The structure in which the front edge of the screen material is formed to have a round cross-sectional shape smoothly guides the airflow flowing into the spaces between the screen materials, and does not create a vortex when passing through the spaces.

[0009]

EXAMPLE FIG. 2 shows a screen body 2 for blinding a cooling tower 1 installed on the roof of a building. The screen body 2 is composed of a base frame 3 assembled in a trapezoid and a screen material 4 attached to four side surfaces of the base frame 3.

The screen material 4 is formed by cutting an extruded aluminum alloy material that is formed into a long shape, has a hollow portion 5 and a base portion 6 in a cross section, and the cross section is tapered from the base portion 6 toward the tip end portion. It becomes a triangle as a whole. However, the upper surface 7 and the lower surface 8 of the tip end portion are de-tapered to be formed in parallel with each other, and the tip end surface 9 is formed into a round cross-sectional shape (FIG. 3). The end portion of the base portion 6 is bent inward to form the engaging portion 10. Code 11
Is a damping material, and is attached to the bottom of the hollow portion 5.

In this embodiment, the screen member 4 is attached to the base frame 3 as follows (FIGS. 1 and 2).
Several horizontal members 12 are fixed to each side surface of the base frame 3 by bolts or welding at intervals vertically. Brackets 13 are fixed to the outer surface of the cross member 12 at predetermined intervals by bolts or welding.

The vertical members 14 are arranged so as to be orthogonal to the horizontal members 12, and are fixed to the corresponding brackets 13 by stringers 15 and bolts 16. When attaching the bracket 13 and the vertical member 14, in and out of the vertical member 14 can be adjusted,
The holes 17 through which the bolts 16 are inserted are elongated holes in the vertical direction and the front-back direction on the vertical member 14 side and the stringer 15 side. The vertical member 14 is formed of an angle member.

The screen material 4 is prepared, and the engaging metal fitting 18 is inserted inside the base portion 6 and mounted on the engaging portion 10.
The engaging metal fitting 18 is a sheet metal processed product, and its upper and lower sides are bent inward so as to fit into the concave portion of the engaging portion 10, and a tap hole 19 is formed in the central portion.

The screen member 4 is arranged in the horizontal direction so as to be orthogonal to the plurality of vertical members 14, and the fixing screw 20 is screwed into the tap hole 19 of the engaging member 18 from the inner surface side of each vertical member 14 to engage the engaging metal. The screen shape member 4 is attached by pulling the tool 18 toward the vertical member 14. One screen member 4 is supported horizontally by a plurality of vertical members 14 and arranged horizontally. In addition,
Since the engagement fitting 18 is slidable inside the screen material 4 before being tightened with the fixing screw 20, it can be accurately positioned at the position of the vertical member 14. The screen material 4 is
They are mounted parallel to each other with a space d (cm) therebetween.

By repeating this, the screen material 4 is attached to the four surfaces of the base frame 3 to form the screen surface on each surface, and the screen body 2 is completed. With the above configuration,
On the screen surface of the completed screen body 2, the airflow that escapes to the inside of the screen body is guided to the rounded tip surface 9 in the cross-sectional shape of the tip of the screen material, smoothly passes through the interval between the profile members, and is rarely swirled. . As a result, there is no vibration of air between the profile members, or extremely weak wind noise does not occur. Also in the measurement result, (a) in FIG.
As shown in (b), the peak around 800 to 1600 Hz disappears.

At this time, if the upper surface 7 and the lower surface 8 are formed parallel to each other at the tip of each screen member 4 as in the embodiment, the airflow becomes smoother and the airflow is less likely to occur. It has the effect of suppressing sound. Also,
If the damping material 11 is attached to the screen material, it is possible to prevent the screen material 4 from resonating and making a loud noise even if a weak vortex is generated and the air between the shapes vibrates.

As means for forming the tip edge of the screen material 4 into a round cross-sectional shape, in addition to integrally forming at the time of extrusion molding as described above, as shown in FIG. There is a way to make it round up. This method has an effect of suppressing the generation of wind noise by applying it to the existing screen body 2. In addition, as shown in FIG.
By separately inserting a long cap 22 having a rounded tip edge into the tip of the screen material 4, the tip edge of the screen material 4 can be formed to have a round cross-sectional shape. This method can also be applied to the existing screen body 2 to suppress the generation of wind noise. The cap 22 may be an aluminum alloy molding material or a synthetic resin molding material. Further, as shown in FIG. 6C, a separately molded one having a semicircular cross section can be attached to the tip of the screen body with an adhesive to form the tip edge of the screen material 4 into a round cross section.

The above is an embodiment, and the present invention is not limited to the illustrated specific configuration. The screen material 4 may be attached to the base frame 3 by first assembling the screen material 4 and the vertical member 14 into a panel-like structure, which is attached to the side of the base frame 3 to which the cross member 12 is attached. Particularly, in fences and handrails, the screen material may be arranged in the left-right direction with a space in the vertical direction.

[0019]

EFFECTS OF THE INVENTION In the screen body in which the screen materials are attached at intervals, annoying wind noise is eliminated.
If a sealing material or a cap is used as a means for forming a rounded tip edge in the cross-sectional shape of the screen material, an emergency measure for suppressing wind noise can be quickly applied.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is a perspective view schematically showing the whole.

FIG. 3 is a perspective view of a main part.

FIG. 4 is a noise measurement diagram (conventional example).

FIG. 5 is a noise measurement diagram (present invention).

FIG. 6 is another embodiment relating to the tip of the screen material.

FIG. 7 is a side view showing a state of an airflow flowing on the screen surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Screen body 3 Base frame 4 Screen material 5 Hollow part 6 Base part 7 Upper surface 8 Lower surface 9 Tip surface 10 Engagement portion 11 Damping material 12 Horizontal material 13 Bracket 14 Vertical material 15 Stringer 16 Bolt 17 Hole 18 Engaging metal fitting 19 Tap hole 20 Fixing screw 21 Sealing material 22 Cap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Sawayama 70 Hayakawa, Takaoka City, Toyama Prefecture Sankyo Aluminum Industry Co., Ltd.

Claims (4)

[Claims] 1. A screen body having a structure in which screen materials are attached at intervals, and a front end edge of the screen material is formed to be round in cross-sectional shape. 2. A structure in which screen materials are attached at intervals, wherein the top surface and the bottom surface of the tip portion are formed parallel to each other in the cross sectional shape of the screen material, and the tip edge is formed round in the cross sectional shape. A screen body characterized by being 3. The screen body according to claim 1 or 2, wherein a sealing material is raised on a front edge of the screen material in a cross-sectional shape, and the outer shape of the front edge is rounded. . 4. The cap according to claim 1 or 2, wherein a cap is attached to a front edge of the screen material in a cross-sectional shape, and the outer shape of the front edge is rounded.
Screen body described in.