JP2009041320A - Attachment to exterior material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce wind noise caused by an attachment to an exterior material of a building. <P>SOLUTION: The attachment to the exterior material of the building has a plurality of serially arranged members arranged in a row, and the plurality of members include ones different in shape from each other. Alternatively the attachment to the exterior material of the building has the serially arranged members, and the arranged members each have a rectangular cross section. Further the members are arranged such that cross sectional centers at the vertical center of the members line up in two ore more rows. The present exterior material attachment breaks the uniformity of members and member arrangement, that is presumed as a cause of wind noise produced by conventional serially arranged members, and by changing the cross section of the members or the arrangement of the members in addition to the cross section, a new structure of the attachment to the exterior material, that can reduce the wind noise, and a method of reducing wind noise, are proposed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a building exterior material accessory such as a balcony handrail, sunshade louver, and blindfolded louver, and more particularly to an exterior accessory having a row arrangement member capable of reducing wind noise (wind noise and wind noise). It is.

Conventionally, a building exterior material accessory generally has an assembly of members arranged in a row (in this specification, an assembly of members is referred to as a “column arrangement member”), It is known that these generate wind noise (wind noise, wind noise) when the wind is strong. Depending on the shape, arrangement, wind direction, and wind speed of the rod-like member or the row-like arrangement member, the wind noise has a sharp peak in the spectrum and may reach a level causing a problem in hearing. Especially in the case of high-rise buildings, wind noise may adversely affect the living environment and surrounding environment.
In order to solve such wind noise problems, the following countermeasures have been proposed.

  Japanese Patent Application Laid-Open No. 10-238252 (Patent Document 1) relates to a handrail structure for the purpose of reducing wind noise. For the purpose of preventing the occurrence of a so-called wind storm phenomenon and reducing noise, A member having a chamfered corner and a cross-sectional shape such as a circle, an ellipse, and an oval is disclosed. The document further describes a vertical crosspiece having the above-mentioned cross-sectional shape for the purpose of “providing a safe handrail structure that has a blindfold function while ensuring daylighting and that does not allow children to pass through”. Proposed a handrail structure that is divided into two rows of vertical bars and rear vertical bars, stating that it is "safe and well-lighted".

  One of the objects of the invention described in Patent Document 1 is to reduce wind noise, and in this respect, is common to the present invention. However, means employed for that purpose are members arranged in a row (patent It is implicitly understood that all the row-shaped arrangement members have the same shape, which is a device of the cross-sectional shape of chamfering the protruding corner of “vertical beam” in Document 1). Here, the “shape” of the member is used to mean a three-dimensional shape including a cross-sectional shape, a cross-sectional area, and the like. In Patent Document 1, it is not considered about the relationship between wind noise and the fact that all the members arranged in a row are the same, or the relationship between wind noise and the arrangement of members arranged in a row, There is no disclosure or suggestion about the possibility of reducing the wind noise by breaking the identity of the member shape or by devising the arrangement. Although a structure in which two rows of vertical rails are arranged in a staggered manner is disclosed, the structure “provides a safe handrail structure that has a blindfold function while ensuring daylighting and does not allow children to pass through. It is intended to be “to do” and is merely evaluated as “safe and well-lighted”.

  On the other hand, Japanese Patent Laid-Open No. 7-238649 (Patent Document 2) discloses that the cross-sectional shape of a member extending in the horizontal direction and the vertical direction is substantially T-shaped for the purpose of reducing wind noise due to the louver fin. An invention that strictly defines numerically is disclosed. The relationship between the cross-sectional shape of the members arranged in rows (referred to as “members extending in the horizontal direction and the vertical direction” in the patent document 2) and wind noise is taught as follows. “The main cause of the noise generated when a strong wind strikes flat plates arranged in a row, such as a conventional louver, is the vortex generated along the thickness direction from the windward end of the flat plate, that is, upstream of the end. In contrast, in the present invention, the cross-sectional shape of the louver fin is substantially T-shaped, and is substantially T-shaped. In the lateral part corresponding to the “thickness of the windward end” of the cross-sectional shape, the corners on both the left and right sides are rounded, so that the roundness is the main element, and this peeling and reattachment It is considered that the generation of noise was suppressed with this as the main effect. (Paragraph 0049)

  In contrast to the invention of Patent Document 1 in which the protruding corners of the members arranged in a row are chamfered in the invention disclosed in Patent Document 2, the protruding corners of the members arranged in a row are expanded to approximately T Although it makes it a character-shaped cross section, the point presupposed that all the members have the same shape is the same as that of patent document 1. Patent Document 2 also pays attention only to the relationship between the cross-sectional shape of the member and the wind noise, and the relationship between the fact that the plurality of members arranged in a row are all the same and the wind noise, and the arrangement of the members No consideration is given to the relationship between wind noise and wind noise. In addition, it is the same as in Patent Document 1 that there is no disclosure or suggestion about the possibility that wind noise can be reduced by breaking the identity of the members arranged in a row or by devising the arrangement. .

Japanese Patent Application Laid-Open No. 2004-19376 (Patent Document 3) also relates to a handrail structure for the purpose of reducing wind noise, and specifically, members arranged in a line (“handrail” in Patent Document 3). And a handrail structure provided with a protrusion at a predetermined position in the cross-section). Also in this document, it is assumed that all members have the same shape, and only attention is paid to the cross-sectional shape of the members, and the shapes of the members arranged in a row are all the same. The relationship between the wind noise and the arrangement of the members and the wind noise is not considered at all. The point that the wind noise can be reduced by the shape and arrangement of the members arranged in a row is not disclosed or suggested in the same manner as in the above-mentioned patent document.
Japanese Patent Laid-Open No. 10-238252 JP-A-7-238649 JP 2004-19376 A Yoshikawa Yu et al., “Study on Wind Noise of Lined Arrangement Members”, Abstracts of Annual Conference of Architectural Institute of Japan, D-1 Volume, 107 pages, September 2006

  The problem to be solved by the present invention is to reduce wind noise of building exterior accessories such as balcony handrails, sunshade louvers, blindfolded louvers, and more specifically to exterior materials that can reduce wind noise. It is to propose a method for reducing object and wind noise.

  In order to solve the above-described problems, the present invention is an exterior material appendage of a building having a row arrangement member composed of a plurality of members arranged in a row, the members having different shapes from each other Proposal of an exterior material accessory that includes

  When an object is present in the airflow, fluid motion such as collision, separation, and backflow of the airflow occurs around it, and pressure fluctuations mainly due to vortex behavior cause wind noise. About the line-shaped arrangement member, the direction facing the surface (the surface formed by the vertical rail of the handrail and the surface formed by the louver) and the wind direction range (wind direction A in FIG. 1) close thereto, and the surface It is known that different types of wind noise are generated in the direction along the wind direction and the wind direction range close thereto (wind direction B in FIG. 1) (Non-Patent Document 1). Considering the airflow characteristics in the vicinity of the building and the frequency characteristics of the wind noise, wind noise generated in the wind direction B with respect to a lattice having a relatively narrow pitch (for example, a pitch of 100 mm or less, or a pitch of 60 mm or less) is a practical problem. (That is, the wind noise is at a level that hinders hearing).

  The detailed sound generation mechanism of the wind noise in the wind direction B has not been elucidated, but it is presumed that the wind noise is amplified by the interaction between the flow field and the sound field between adjacent members. Therefore, the above-mentioned wind noise is reduced by breaking the “uniformity of members and member placement”, which is considered to be the cause of wind noise with conventional row-arranged members, and changing the member placement in addition to the cross-sectional shape or cross-sectional shape. What can be done is a new discovery. The present invention has been completed based on such findings and further confirming the effect by wind tunnel experiments. The present invention proposes a specific exterior material appendage structure and wind noise reduction method capable of reducing wind noise.

  Here, the columnar arrangement member refers to an assembly formed of a plurality of rod-like members such as a vertical rail of a balcony handrail, a sunshade louver, or a blindfold louver. The members constituting the columnar arrangement member may be a plurality of members having substantially the same shape provided substantially in parallel with each other, but in particular in the present invention, the columnar arrangement member is composed of a plurality of member groups. If the member group is different, the shape of the member is different, but the members of the same member group have substantially the same shape. The exterior material appendage is a so-called balcony handrail structure, a sunshade louver or a blind louver structure, and includes the row-shaped arrangement member.

  The “shape” of the columnar arrangement member is a shape defined in a three-dimensional space. Even if the members have substantially the same cross-sectional area and cross-sectional shape, one of the members in the vicinity of the end portion is linear while the other is bent (for example, an I-type member having the same cross section and J The mold member is considered to have a different shape. In addition, even if they are of the same shape when they are taken out and compared alone, they also have shapes (in a three-dimensional sense) that are not parallel to each other due to different mounting angles etc. Think different. In other words, two members that do not overlap each other even when translated are considered to have different shapes. The cross-sectional area or the cross-sectional shape means a cross-sectional area or a cross-sectional shape in a cross section formed on a surface perpendicular to the longitudinal direction of the member unless otherwise specified. The term “including members having different shapes” means, for example, that the arrangement member in a row is constituted by a group of members whose cross-sectional shape is A and a group of members whose cross-sectional shape is B, or Although the area is the same, the case where the member which has a bend in an edge part, and a linear member correspond is applicable.

  The plurality of columnar arrangement members may be arranged so that a cross-sectional center forms two or more rows in the vicinity of the central portion in the length direction. For example, the member arrangement as shown in FIG. 2 is a typical example, but many other variations are conceivable as will be described in detail later. With such a structure, amplification of wind noise due to the interaction between the flow field and the sound field between adjacent members can be more effectively suppressed.

  The plurality of row-like arrangement members may have both ends attached substantially in a row, and at least some of the row-like arrangement members may have bent portions. Such a structure is, for example, the structure illustrated in FIG. FIG. 3A is a horizontal cross-sectional view at the center position in the height direction of the row arrangement member, and FIG. 3B is a side view. According to FIG. 3A, a group of members 300 whose sections are outlined are arranged in a row, and a group of members 310 whose sections are shown in gray are also arranged in a row, but each row is on the same line. Not located. However, the member 300 is bent in the vicinity of both end portions. As a result, as is apparent from FIG. 3B, the end attachment positions of the members 300 and 310 are in a straight line. With such a structure, it is not necessary to increase the depth of the horizontal handrail member and the lower attachment member (horizontal member) in the case of the member for attaching the row-like arrangement member or the veranda handrail structure.

  A plurality of columnar arrangement members having different cross-sectional areas and cross-sectional shapes are arranged in two rows on the outer side and the inner side when viewed from the building, and the outer edge portion of the columnar arrangement member constituting the outer row constitutes the inner row You may locate outside the outer edge part of a shape-arrangement member. Or the outer edge part of two rows may comprise the same plane, and the inner edge part may not be the same plane. Furthermore, two types of members having different shapes may be arranged in one row. It is preferable that the above-described exterior material appendage is designed to reduce wind noise generated by the exterior material appendage particularly in a strong wind. Here, the time of strong wind refers to a case where the wind speed is about 10 m / second or more.

An object of the present invention is a building exterior material appendage having a plurality of row arrangement members, the plurality of row arrangement members having a substantially rectangular cross section, and a cross-sectional center at a central portion in a length direction. Can also be achieved with an exterior appendage that is arranged to form two or more rows. That is, as shown in FIGS. 6A and 6B, even if the plurality of row-arranged members are linear members having the same rectangular cross section, wind noise can be reduced by appropriately arranging them. .
Here, the substantially rectangular shape is a shape in which the corners of a rectangle (including a square) are rounded, and the corner portion has an arc shape with an r (radius) of about 1 mm or less, or the corner portion is It is meant to include those having an arc shape of about 1/10 or less of the member's found width (the width of the member when the member is viewed from the outside of the building toward the building) and those closer to a rectangle.

In this case, for example, in FIG. 8A, the thickness a in the horizontal direction (X-axis direction) of the row-shaped arrangement members and the interval b measured in the same direction of the adjacent row-shaped arrangement members satisfy the relationship of a <b. It is desirable. In this case, as long as the above relationship is satisfied, it is not always essential that the row-shaped arrangement member has a rectangular cross section (herein, “rectangular” is used to include “square”). In one example, the center distance in the X-axis direction between adjacent row-shaped arrangement members is about 60 mm.
The distance in the vertical direction (Y-axis direction) between the first row and the second row of the columnar arrangement members may be larger than the vertical dimension of the row arrangement members, as shown in FIG. 8A. It may be small as shown in FIG. 8B.

  Hereinafter, the present invention will be described in detail with reference to examples. However, it is needless to say that the examples are given to help the understanding of the invention, and the present invention is not limited to these examples.

For the purpose of confirming the effect of the present invention, a wind tunnel experiment was conducted using a balcony handrail structure as an example. There are two types of row arrangement members described below.
Example 1: A structure in which two types of linear members having different cross-sectional shapes are provided in parallel with each other in a staggered manner.
Comparative example: A structure in which linear members having the same rectangular cross section are provided in a row in parallel.
Wind noise at a wind speed of 15 m / sec is applied to the row arrangement member at a wind direction angle (angle formed by a perpendicular to the plane constituted by the arranged row arrangement members and the wind direction) of 70 °. Measurement was performed (see FIG. 4).

  The result is shown in FIG. The frequency characteristic (black line) of the sound pressure level of the comparative example has some remarkable peaks, whereas the frequency characteristic (gray) of the sound pressure level when the present invention (Example 1) is used. The line) has a gentle peak, which indicates that wind noise, which is a problem in hearing, is significantly reduced.

Further, a wind tunnel experiment was conducted on the same comparative example as described above in order to confirm the wind noise reduction effect of the second embodiment of the present invention shown in FIG.
Example 2: A structure in which linear members having the same rectangular cross section are provided in parallel with each other in a staggered manner.
The wind conditions are the same as in FIG.
The result is shown in FIG. Similar to the first embodiment, when the present invention (second embodiment) is used, the frequency characteristic (gray line) of the sound pressure level has a gentle peak, and wind noise that causes problems in hearing is noticeable. Is shown to be reduced.

FIG. 8 shows a horizontal cross section at the center position in the height direction for various variations of the row arrangement member according to the present invention. It goes without saying that these are merely examples and the present invention is not limited thereto.
8A and 8B show an example in which a member belonging to the outside air (windward) row and a member belonging to the building side (leeward) row have substantially the same cross section. These members may be linear members as described above, but the members belonging to the outside air side (windward side) are near the upper and lower end portions like the members shown in white in FIG. It is bent and the three-dimensional shape may be different from the building side (leeward side) member. In the example shown in FIGS. 8C to 8G, the member may have a bent portion or may not have a bent portion. 8A to 8G include ones having different shapes from each other.

Conceptual diagram showing the relationship between the row arrangement member and the wind direction Sectional drawing which illustrated the row-shaped arrangement | positioning member based on this invention Example of a row arrangement member according to the present invention in which both end portions are positioned in a straight line and the central portion is arranged in two rows of an outer side and an inner side Conceptual diagram (horizontal cross-sectional view) of a row arrangement member (Example 1) subjected to a wind tunnel experiment Frequency characteristics of sound pressure level of wind noise obtained by wind tunnel experiment (Example 1) Conceptual diagram (horizontal sectional view) of a row arrangement member (Example 2) subjected to a wind tunnel experiment Frequency characteristics of sound pressure level of wind noise obtained by wind tunnel experiment (Example 2) Variations of the row arrangement member according to the present invention

Explanation of symbols

300 Member 310 with Bends at Both Ends Linear Member

Claims (5)

  A building exterior accessory having a row arrangement member in which a plurality of members are arranged in a row, wherein the plurality of members include those having different shapes.   The exterior material appendix according to claim 1, wherein the plurality of members are arranged so that a center of a cross section in a central portion in a length direction forms two or more rows.   A building exterior material accessory having a row arrangement member in which a plurality of members are arranged in a row, the plurality of members having a substantially rectangular cross section, and the center of the cross section at the central portion in the length direction. Exterior material appendages arranged to form two or more rows.   4. The exterior material appendix according to claim 2, wherein both ends of the plurality of members are substantially attached in a row, and at least a part of the row-shaped arrangement members has a bent portion.   A plurality of members having different shapes are arranged in two rows on the outer side and the inner side when viewed from the building, and the outer edge portion of the member constituting the outer row is outside the outer edge portion of the row-like arrangement member constituting the inner row. The exterior material appendix according to any one of claims 1 to 4, which is located.

Images