JPH08239949A - Screen-surface forming material - Google Patents

Abstract

PURPOSE: To damp vibrations at an early stage by setting the direction where a hollow penetrate as the vertical direction, and the direction orthogonal to the vertical direction as the horizontal direction in the peripheral wall of a screen-surface-forming material consisting of hollow profiles and forming a slit having a vertical component. CONSTITUTION: When a tower screen 1 receives a strong wind, a wind passed through clearances among each screen-surface forming material 4 forms a Karman vortex on the leeward side of a screen surface 2. The vortex is changed variously by the alteration of wind force while the whole is vibrated violently, and the vibrations are transmitted to the forming materials 4. A wave motion is circulated and is difficult to be damped when a cross section is formed in a closed graphic in the vibrations, but the circulation of the wave motion is inhibited at the place where the closed graphic is parted by slits 5, and the vibrations are damped at an early stage. Even when the vibrations coincide with the natural frequency of the forming materials 4 and are brought to a resonant state, the state is not extended, and is not developed up to noises. Accordingly, noises can be lowered, and structure is simplified, thus reducing an increase in cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tower screen,
The present invention relates to a movable gate, a shutter, a shoji screen or a door, a handrail, and the like, which are provided with a structure in which noise caused by wind or impact during operation is suppressed.

[0002]

2. Description of the Related Art In tower screens, movable gates, shutters, shoji doors, doors, handrails and the like, hollow members having a closed cross section are often used because of their weight reduction and strength problems. However, a hollow profile whose cross section is a closed figure is characterized in that the transverse waves generated in a part of the peripheral wall circulate around the continuous peripheral wall and are not easily attenuated. For example, the screen surface of a tower screen on the roof of a building is often constructed by arranging a large number of hollow aluminum extruded shapes in parallel, but during strong winds, Karman vortices are generated on the leeward side of the screen surface, and this vortex itself vibrates violently. , This vibration is transmitted to the profile that constitutes the screen surface. At this time, because of the strength and cross-sectional shape, if a hollow shape material whose cross section is a closed figure is used, the vibration transmitted from the vortex to the shape material is not easily attenuated, and the resonance of the shape material may occur depending on the frequency. The condition is amplified and emits annoying noise.

Further, in the case of a shutter having a flat slat, when the shutter surface is folded, the folded slat produces a rattling sound, and this slat is also formed by a hollow shape member having a closed cross section. Then
It feels reverberant and the noise level is increasing. Movable gates, doors, or handrails generate sound due to impact when opening and closing or impact when objects hit, but these frames, frames or horizontal members are formed of hollow shape members that are closed figures in cross section If the decay is slow. Regarding the hollow profile, in the present specification, the direction in which the hollow of the profile penetrates is the longitudinal direction, the direction orthogonal to this is the lateral direction, and the direction in which the circumferential surface of the profile is traversed along the cross section is the circumferential direction. Enter.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a screen surface forming material, which is a hollow shape member having a closed cross section, is used as a screen surface of a tower screen, a gate surface of a movable gate, a shielding surface of a shutter, a shoji or When used to form a surface (screen surface) for shielding or partitioning as a whole such as a door or handrail, early dampen the vibration in the cross-sectional circumferential direction of the forming material itself caused by wind or impact during operation. This is an issue.

[0005]

[Means for Solving the Problems] A peripheral surface of a screen surface forming member made of a hollow shape member having a closed cross-section has a longitudinal direction in which the hollow portion of the shape member penetrates the vertical direction, and is orthogonal to this. A slit having a vertical direction component is formed with the horizontal direction as the direction. The following configuration may be adopted.
Forming multiple slits in a line in the vertical direction. A plurality of slits are arranged in a row in the longitudinal direction, the rows are formed in parallel in the circumferential direction of the profile, and the ends of each slit are arranged to overlap each other in the circumferential direction of the profile. .

A plurality of slits inclined at the same angle with respect to the vertical direction are formed in parallel with each other at intervals in the vertical direction, and the ends of the slits are arranged to overlap each other in the circumferential direction of the profile. To be.

[0007]

The slit having a vertical direction component in the screen surface forming material divides the peripheral wall of the hollow shape member having a closed cross section to prevent vibration from being transmitted in the peripheral direction. The structure in which the ends of the slits are overlapped with each other in the circumferential direction is such that the dividing portion of the peripheral wall appears in any cross section.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a tower screen 1 constructed on the roof of a building, which surrounds a cooling tower not shown in the figure, and four screen surfaces 2 are attached to columns 3. Each screen surface 2 is composed of a large number of screen surface forming members 4 (hollow shape members) arranged in parallel in the horizontal direction. Each screen surface forming material 4 (Fig. 2A, C)
Is formed by forming a slit 5 by milling on an aluminum extruded material having a rectangular closed cross-section (the same c) at the beginning of molding. As a result, a part of the cross section of the screen surface forming material 4 at the beginning of molding is divided into a closed figure by the slit 5 (Fig. 2B). Each screen surface forming material 4 is fixed to the column 3 with the surface on which the slit 5 is formed as the inside of the tower screen 1.

When the wind is strong, the tower screen 1 on the roof of the building receives a proper wind, and the wind passing through the gaps between the screen surface forming members 4 forms Karman vortices inside the screen surface 2 receiving the wind (downward side). To do. The vortex changes greatly in magnitude due to changes in wind force and violently vibrates as a whole, and the vibration is transmitted to the screen surface forming material 4. This vibration is shown in Figure 3.
(A) It is a kind of transverse wave that crushes or stretches the cross-section figure of a hollow shape like (b), and this wave is difficult to be attenuated by circulating waves if the figure has a closed cross-section. .

However, when the closed figure of the cross section is divided by the slit 5, the circulation of the wave is obstructed at that portion, and the vibration is damped early and ends. This is the same for the higher-order shear waves that occur at the same time. Therefore, in the tower screen 1 using the screen surface forming material 4 provided with the slits 5, even if the vibration due to the Karman vortex coincides with the natural frequency of the screen surface forming material 4 and becomes a resonance state, this state is expanded. There is nothing to do and it does not develop into noise.

In order to attenuate the wave of the transverse wave transmitted in the circumferential direction of the screen surface forming material 4 at a high rate, it is preferable to provide the slit 5 in the widest possible area in the longitudinal direction of the hollow profile. Therefore, as the arrangement of the slits 5 in the screen surface forming material 4, a plurality of slits 5 are formed so as to be aligned in a row in the vertical direction, and the gap between the ends of the slits 5 is formed by using this hollow shape member. The structure is made as small as possible without impairing its strength (Fig. 2).
B) or a row of a plurality of slits 5 aligned in a row in the vertical direction is formed in parallel in the circumferential direction of the screen surface forming material 4, and the ends of the slits 5 are mutually arranged in the circumferential direction of the hollow shape member. A plurality of slits 5 that are arranged so as to overlap with each other (FIG. 4) or that are inclined at the same angle with respect to the vertical direction are formed in parallel at intervals in the vertical direction. It is conceivable to adopt a structure (FIG. 5) in which the parts overlap each other in the circumferential direction of the profile. That is,
The slit 5 may have any vertical component,
It is preferable to arrange them so that some of them overlap each other in the circumferential direction.

In the structure of FIG. 2 (a), a closed figure remains in the cross section of the screen surface forming material 4, but in the other structures illustrated, the closed figure is divided regardless of the cross section. Higher vibration damping effect. The arrangement of the slit 5 is
It is selected according to the place where the screen surface forming material 4 is used and the required strength. The slit 5 may be filled with a sealing material or a resin filling for the purpose of preventing dust whistling due to wind or improving the appearance. Even in this case, the filling is the screen surface forming material 4
Since it is different from the material of (1) or is not fixed integrally, it does not interfere with the vibration damping effect.

Screen surface forming material 4 provided with slits 5
Is not limited to the columnar shape or the rod shape as shown in FIG. 2, but may be flat (FIG. 6) or circular in cross section (FIG. 7). FIG. 8 shows an example in which the screen surface forming material 4 provided with the slits 5 is used for the vertical and horizontal frame members 8 and the lattice bars 9 that form the gate surface 7 of the movable gate 6. The gate surface 7 of the movable gate 6 shields the entrance / exit, but each time it is opened and closed, the screen surface 7 receives a certain amount of impact and emits a sound. However, vibration due to impact is rapidly attenuated by the presence of the slit 5, and noise is reduced. FIG. 9 shows an example in which the screen surface forming material 4 having a flat cross section is used as the slats 12 forming the shielding surface 11 of the shutter 10. Since the slats 12 of this kind collide with each other when the shielding surface 11 is folded, vibration is generated due to the impact and makes a rattling noise, but when the screen surface forming material 4 provided with the slits 5 is used as the slats 12. The sound is dull and quiet, and the noise is considerably suppressed.

FIG. 10 shows an example in which the screen surface forming material 4 having a rectangular cross section is used for the frame 14 of the door 13. In this example, a slit 5 is formed on the inner side surface of the door 13 so as to make it inconspicuous. Has been done. Vibration due to impact when the door is closed is rapidly attenuated, and collision noise is reduced. Figure 11
Is an example in which the screen surface forming material 4 having a circular cross section is used for the handrail 15, and the slit 5 is formed on the lower surface side and is also filled. The above is an embodiment, and the present invention is not limited to the illustrated specific configuration. The material of the hollow shape material that becomes the screen surface forming material 4 is not limited to aluminum, but may be synthetic resin or steel material, and is not limited to an extrusion molding material.

[0015]

According to the first aspect of the present invention, since the screen surface is formed by using the screen surface forming material made of a hollow shape member, the tower screen is lightweight and has high strength, and strong wind. The noise of the tower screen during time is reduced. Furthermore, the structure for suppressing noise is simple, and the product cost is rarely increased. According to the configuration of claim 2, since the range in which the slit is provided is long and thin in the vertical direction, it is easy to dispose the slit in an inconspicuous place in the screen surface forming material. According to the configuration of claim 3, since the ends of the slits are overlapped with each other in the circumferential direction, the closed figure is divided in any cross section, and the effect of suppressing noise generation is greater.

According to the structure of claim 4, the range in which the slits are provided can be arranged to be long in the longitudinal direction and have a relatively narrow width, and the ends of each slit can be superposed on each other in the circumferential direction. The effect of suppressing the generation of noise is great, and the slits can be easily arranged at inconspicuous points. According to the configuration of claim 5, whistling noises and the like caused by the slits can be further prevented, and dust, dust, insects and the like can be prevented from entering the hollow shape member, and the durability of the hollow shape member can be improved. To do.
According to the structure of claim 6, a movable gate that is lightweight and has high strength can be formed. Further, noise due to impact when the movable gate is opened and closed is reduced. Furthermore, the structure for suppressing noise is simple, and the product cost is rarely increased.

According to the configuration of claim 7, since the hollow shape member is used for the slats, the strength of the slats is high, and
The opening and closing of the shutter is light. Furthermore, the impact noise when the shield surface is folded is reduced. According to the structure of claim 8, the strength of the shoji screen or the door is high, the opening and closing can be lightened, and the impact noise at the time of opening and closing is reduced. According to the structure of claim 9, the vibration due to the impact when an object collides with the handrail is rapidly attenuated, so that the generation of noise is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a tower screen.

2A is a front view, FIG. 2B is a cross sectional view taken along line AA, and FIG. 2C is a cross sectional view taken along line BB.

FIG. 3 is a diagram illustrating a vibration state.

FIG. 4 is a front view of a second example.

FIG. 5 is a front view of a third example.

FIG. 6 is a perspective view of a fourth example.

FIG. 7 is a perspective view of a fifth example.

FIG. 8 is a perspective view of a movable gate.

FIG. 9 is a perspective view showing a part of a shutter.

FIG. 10 is a perspective view of a door

FIG. 11 is a perspective view showing a part of the handrail.

[Explanation of symbols]

 1 Tower Screen 2 Screen Surface 3 Support 4 Screen Surface Forming Material 5 Slit 6 Movable Gate 7 Screen Surface 8 Frame Material 9 Lattice Bar 10 Shutter 11 Shielding Surface 12 Slat 13 Door 14 Frame 15 Handrail

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G10K 11/172 G10K 11/16 E

Claims (9)

[Claims] 1. A vertical direction is defined as a direction in which a hollow portion of a profile having a hollow portion penetrates is defined as a vertical direction, and a direction orthogonal to the vertical direction is defined as a horizontal direction.
A screen surface forming material having a closed figure in a cross section and slits having a vertical component formed in a peripheral wall. 2. The screen surface forming material according to claim 1, wherein a plurality of slits are formed in a line in the vertical direction. 3. A plurality of slits are arranged in a line in the longitudinal direction, a plurality of slit rows are formed in parallel in the circumferential direction of the profile, and the ends of each slit are in the circumferential direction of the profile. The screen-forming material according to claim 2, wherein the screen-forming material is arranged so as to be mutually polymerized with each other. 4. An arrangement in which a plurality of slits are inclined at the same angle with respect to the vertical direction and are formed in parallel at intervals in the vertical direction, and the ends of each slit overlap each other in the circumferential direction of the profile. The screen forming material according to any one of claims 1 to 3, wherein the screen forming material is provided. 5. The screen forming material according to any one of claims 1 to 4, wherein the slits are filled with a filling material. 6. A gate surface for blocking an entrance / exit,
A movable gate comprising the screen forming material according to any one of claims 1 to 5. 7. The slat forming the shielding surface according to claim 1.
~ A shutter characterized by being any one of the screen forming materials according to claim 5. 8. A shoji or door, characterized in that any one of the screen forming materials according to any one of claims 1 to 5 is used for a frame or a frame. 9. A handrail, characterized in that any one of the screen-forming materials according to any one of claims 1 to 5 is used for the lateral member.