JP2022137309A

JP2022137309A - Duct with reinforcing rib

Info

Publication number: JP2022137309A
Application number: JP2022118139A
Authority: JP
Inventors: 勇梶野; Isamu Kajino
Original assignee: Shinfuji Kuuchou Co Ltd
Current assignee: Shinfuji Kuuchou Co Ltd
Priority date: 2019-01-22
Filing date: 2022-07-25
Publication date: 2022-09-21
Also published as: JP2020118329A; JP7185280B2

Abstract

PROBLEM TO BE SOLVED: To provide a duct with a reinforcing rib which is simple in a constitution, and can be easily manufactured.

SOLUTION: Four pieces of wall plates 2 to 5 are joined to one another, and formed into substantially-square cylindrical shape. Air flows in an axial direction. Center parts of the wall plates 2 to 5 are folded into two pieces, and protruded outward. Reinforcing ribs 23 and 33 extending in a direction orthogonal to the axial direction are formed. A connection metal fixture 7 for connecting end parts of the adjacent reinforcing ribs 23 and 33 is disposed. The connection metal fixture 7 is a substantially-L shaped flat plate, inserted into a clearance between one-side reinforcing ribs 23 at one end part, and inserted into the other-side reinforcing ribs 33 at the other end part.

SELECTED DRAWING: Figure 1

Description

本発明は、温度調整された空気などを流すダクトに関し、特に、空気の流れ方向と略直交する方向に延びる補強リブを有する補強リブ付きダクトに関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct for flowing temperature-controlled air, and more particularly to a reinforcing ribbed duct having reinforcing ribs extending in a direction substantially perpendicular to the direction of air flow.

ダクトは、建物の天井内などの構造物内に複数設置されて空気の流路を形成し、温度調整された空気などを流す。このようなダクトで断面が四角い角ダクトにおいては、大きさが所定以上の場合や所定の使用形態の場合には、空気の流れ方向と略直交する方向に延びる補強材を設ける必要がある。従来、補強材を設ける場合、山形鋼で構成された補強材をダクトの側壁表面にスポット溶接やリベットで取り付けていた。 A plurality of ducts are installed in a structure such as the ceiling of a building to form an air flow path and flow temperature-controlled air. In such a square duct with a square cross section, it is necessary to provide a reinforcing member extending in a direction substantially orthogonal to the air flow direction when the size is larger than a predetermined size or when the duct is used in a predetermined manner. Conventionally, when a reinforcing member is provided, the reinforcing member made of angle iron is attached to the side wall surface of the duct by spot welding or riveting.

しかしながら、山形鋼で成る補強材をスポット溶接やリベットで取り付ける場合、材料費や労力、時間を要し、費用が嵩むばかりでなく、補強材が山形鋼であるためダクト全体の重量が重くなる、という問題があった。このため、補強材の取り付けを不要にすることができるダクトが知られている（例えば、非特許文献１参照。）。このダクトは、各側壁の中央部を２つ折りして外側に突出させ、流れ方向と略直交する方向に延びる補強リブが形成されている。そして、隣接する補強リブの端部同士が連結金具で覆われて連結されているものである。 However, attaching angle steel reinforcing members by spot welding or riveting requires material costs, labor, and time. There was a problem. For this reason, a duct is known that eliminates the need to attach a reinforcing member (see, for example, Non-Patent Document 1). In this duct, the central portion of each side wall is folded in two to protrude outward, and reinforcing ribs extending in a direction substantially perpendicular to the direction of flow are formed. The end portions of adjacent reinforcing ribs are covered and connected with connecting fittings.

特開２００７－１４７２６９号公報JP 2007-147269 A

ところで、特許文献１に記載のダクトでは、隣接する補強リブの端部同士を覆うように連結金具が複雑な形状に形成されているため、製作費が嵩むばかりでなく、取り扱いが煩雑であった。しかも、この連結金具をスポット溶接で壁板（側壁）に固定しなければならず、労力と時間、費用を要していた。 By the way, in the duct described in Patent Document 1, the connecting fittings are formed in a complicated shape so as to cover the ends of the adjacent reinforcing ribs. . Moreover, the connecting fittings had to be fixed to the wall plate (side wall) by spot welding, which required labor, time, and cost.

そこで本発明は、構成が簡易で容易に製作が可能な補強リブ付きダクトを提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a duct with reinforcing ribs that has a simple structure and can be manufactured easily.

上記目的を達成するために請求項１に記載の発明は、４つの壁板が接合されて略四角い筒状に形成され、軸方向に空気が流れ、前記各壁板の中央部を２つ折りして外側に突出させ、軸方向と略直交する方向に延びる補強リブが形成され、隣接する前記補強リブの端部同士を連結する連結金具を備え、前記連結金具は、略Ｌ字状の平板で、一端部が一方の前記補強リブの端部にボルト締結され、他端部が他方の前記補強リブの端部にボルト締結される、ことを特徴とする補強リブ付きダクトである。 In order to achieve the above object, the invention according to claim 1 has four wall plates joined together to form a substantially square cylinder, air flows in the axial direction, and the central portion of each wall plate is folded in two. a reinforcing rib extending in a direction substantially perpendicular to the axial direction, and connecting fittings connecting the ends of the adjacent reinforcing ribs, wherein the connecting fittings are substantially L-shaped flat plates. , one end of which is bolted to one end of the reinforcing rib, and the other end of which is bolted to the other end of the reinforcing rib.

請求項２に記載の発明は、請求項１に記載の補強リブ付きダクトにおいて、前記連結金具の角部の外縁が円弧状に形成され、前記連結金具の両端部が前記ボルト締結された際に、前記連結金具の角部の外縁が前記補強リブの外縁よりも突出するように形成されている、ことを特徴とする。 The invention according to claim 2 is the duct with reinforcing ribs according to claim 1, wherein the outer edges of the corners of the connecting fittings are formed in an arc shape, and when both ends of the connecting fittings are fastened with the bolts, , wherein the outer edges of the corners of the connecting fittings are formed to protrude beyond the outer edges of the reinforcing ribs.

請求項３に記載の発明は、４つの壁板が接合されて略四角い筒状に形成され、軸方向に空気が流れ、前記各壁板の中央部を２つ折りして外側に突出させ、軸方向と略直交する方向に延びる補強リブが形成され、隣接する前記補強リブの端部同士を連結する連結金具を備え、前記連結金具は、略Ｌ字状の平板で、一端部が一方の前記補強リブの間に挿入され、他端部が他方の前記補強リブの間に挿入される、ことを特徴とする補強リブ付きダクトである。 According to the third aspect of the invention, four wall plates are joined together to form a substantially square cylinder, air flows in the axial direction, and the central portion of each wall plate is folded in two to protrude outward. A reinforcing rib extending in a direction substantially perpendicular to the direction is formed, and a connecting fitting for connecting the ends of the adjacent reinforcing ribs is provided. The connecting fitting is a substantially L-shaped flat plate, and one end of the A duct with reinforcing ribs, characterized in that it is inserted between reinforcing ribs and the other end is inserted between the other reinforcing ribs.

請求項４に記載の発明は、請求項３に記載の補強リブ付きダクトにおいて、前記連結金具の角部の外縁が円弧状に形成され、前記連結金具の両端部が前記補強リブの間に挿入された際に、前記連結金具の角部の外縁が前記補強リブの外縁よりも突出するように形成されている、ことを特徴とする。 The invention according to claim 4 is the duct with reinforcing ribs according to claim 3, wherein the outer edges of the corners of the connecting fittings are formed in an arc shape, and both ends of the connecting fittings are inserted between the reinforcing ribs. An outer edge of a corner portion of the connecting fitting is formed to protrude beyond an outer edge of the reinforcing rib when the connecting fitting is attached.

請求項１に記載の発明によれば、各壁板の中央部を２つ折りして補強リブが形成されているため、山形鋼から成る補強材をスポット溶接やリベットで取り付ける必要がない。また、連結金具の両端部を隣接する補強リブの端部にボルト締結するだけで、隣接する補強リブの端部同士を連結することができ、従来のように連結金具をスポット溶接する場合に比べて、労力と時間、費用を軽減することが可能となる。このように、構成が簡易で容易に製作することが可能となる。また、連結金具が略Ｌ字状の平板で単純な形状のため、取り扱いや保管、運搬などがしやすい。 According to the first aspect of the invention, since the reinforcing rib is formed by folding the central portion of each wall plate in two, there is no need to attach a reinforcing member made of angle steel by spot welding or riveting. In addition, it is possible to connect the ends of adjacent reinforcing ribs simply by bolting both ends of the connecting fittings to the ends of the adjacent reinforcing ribs. Therefore, it is possible to reduce labor, time and cost. In this way, the structure is simple and can be easily manufactured. In addition, since the connecting fitting is a substantially L-shaped flat plate and has a simple shape, it is easy to handle, store, and transport.

請求項２に記載の発明によれば、連結金具の両端部を補強リブの端部にボルト締結した状態、つまり、隣接する補強リブの端部同士を連結金具で連結した状態で、連結金具の角部の円弧状の外縁が補強リブの外縁よりも突出する。このため、補強リブの端部で手を傷つけたり外部に損傷を与えたりするのを、より確実に防止、抑制することが可能となる。 According to the second aspect of the invention, the connecting metal fittings are connected to each other in a state in which both ends of the connecting metal fittings are bolted to the ends of the reinforcing ribs, that is, in a state in which the ends of the adjacent reinforcing ribs are connected by the connecting metal fittings. The arc-shaped outer edges of the corners protrude beyond the outer edges of the reinforcing ribs. For this reason, it is possible to more reliably prevent and suppress injury to hands and external damage caused by the ends of the reinforcing ribs.

請求項３に記載の発明によれば、各壁板の中央部を２つ折りして補強リブが形成されているため、山形鋼から成る補強材をスポット溶接やリベットで取り付ける必要がない。また、連結金具の両端部を隣接する補強リブの間（隙間）に挿入するだけで、隣接する補強リブの端部同士を連結することができ、従来のように連結金具をスポット溶接する場合に比べて、労力と時間、費用を軽減することが可能となる。このように、構成が簡易で容易に製作することが可能となる。また、連結金具が略Ｌ字状の平板で単純な形状のため、取り扱いや保管、運搬などがしやすい。 According to the third aspect of the invention, since the reinforcing rib is formed by folding the central portion of each wall plate in two, there is no need to attach a reinforcing member made of angle iron by spot welding or riveting. In addition, just by inserting both ends of the connecting metal fittings into the gaps between the adjacent reinforcing ribs, the ends of the adjacent reinforcing ribs can be connected. It is possible to reduce labor, time and cost. In this way, the structure is simple and can be easily manufactured. In addition, since the connecting fitting is a substantially L-shaped flat plate and has a simple shape, it is easy to handle, store, and transport.

請求項４に記載の発明によれば、連結金具の両端部を補強リブの間に挿入した状態、つまり、隣接する補強リブの端部同士を連結金具で連結した状態で、連結金具の角部の円弧状の外縁が補強リブの外縁よりも突出する。このため、連結金具の角部が補強リブの間に入って連結金具がずれてしまうのを防止、抑制することができ、隣接する補強リブの端部同士を適正に連結することが可能となる。さらに、補強リブの端部で手を傷つけたり外部に損傷を与えたりするのを、より確実に防止、抑制することが可能となる。 According to the fourth aspect of the invention, in a state in which both ends of the connecting fitting are inserted between the reinforcing ribs, that is, in a state in which the ends of the adjacent reinforcing ribs are connected by the connecting fitting, the corners of the connecting fitting are The arc-shaped outer edge of the reinforcing rib protrudes from the outer edge of the reinforcing rib. Therefore, it is possible to prevent or suppress the misalignment of the connecting fitting due to the corner of the connecting fitting entering between the reinforcing ribs, and it is possible to properly connect the ends of the adjacent reinforcing ribs. . Furthermore, it is possible to more reliably prevent and suppress injury to hands and damage to the outside at the ends of the reinforcing ribs.

この発明の実施の形態１に係る補強リブ付きダクトを示す斜視図である。1 is a perspective view showing a duct with reinforcing ribs according to Embodiment 1 of the present invention; FIG. 図１の補強リブ付きダクトの第１の壁板を示す斜視図である。2 is a perspective view showing a first wall plate of the duct with reinforcing ribs of FIG. 1; FIG. 図２のＡ部拡大図である。FIG. 3 is an enlarged view of part A in FIG. 2 ; 図１の補強リブ付きダクトの第２の壁板を示す斜視図である。2 is a perspective view showing a second wall plate of the duct with reinforcing ribs of FIG. 1; FIG. 図４のＢ部拡大図（ａ）と、第１の壁板と第２の壁板のハゼ接合状態を示す断面図（ｂ）である。It is the sectional view (b) which shows the B part enlarged view (a) of FIG. 4, and the seam joint state of a 1st wall plate and a 2nd wall plate. 図１の補強リブ付きダクトのコーナーピース周辺を示す拡大斜視図である。2 is an enlarged perspective view showing the periphery of a corner piece of the duct with reinforcing ribs in FIG. 1; FIG. 図１の補強リブ付きダクトの連結金具を示す正面図である。FIG. 2 is a front view showing a connecting fitting of the duct with reinforcing ribs in FIG. 1; 図７の連結金具の取付状態を示す斜視図である。FIG. 8 is a perspective view showing an attached state of the connecting fitting of FIG. 7; この発明の実施の形態２に係る連結金具の取付状態を示す斜視図である。FIG. 7 is a perspective view showing a mounting state of a connecting fitting according to Embodiment 2 of the present invention; この発明の実施の形態３に係る連結金具の取付状態を示す斜視図である。FIG. 11 is a perspective view showing a mounting state of a connecting fitting according to Embodiment 3 of the present invention;

以下、この発明を図示の実施の形態に基づいて説明する。 BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments.

（実施の形態１）
図１は、この実施の形態に係る補強リブ付きダクト１を示す斜視図である。この補強リブ付きダクト１は、補強リブ２３、３３等を備えるダクトであり、４つの壁板２～５が接合されて略四角い筒状に形成され、軸方向に空気が流れるようになっている。ここで、相対向する第１の壁板２と第３の壁板４とが同等な構成で、相対向する第２の壁板３と第４の壁板５とが同等な構成なため、主として、第１の壁板２と第２の壁板３について説明する。 (Embodiment 1)
FIG. 1 is a perspective view showing a duct 1 with reinforcing ribs according to this embodiment. The reinforcing rib-equipped duct 1 is a duct provided with reinforcing ribs 23, 33, etc., and is formed in a substantially square tubular shape by joining four wall plates 2 to 5 so that air flows in the axial direction. . Here, since the first wall plate 2 and the third wall plate 4 facing each other have the same structure, and the second wall plate 3 and the fourth wall plate 5 facing each other have the same structure, Mainly, the first wall plate 2 and the second wall plate 3 will be explained.

第１の壁板２は、図２に示すように、略長方形の板材で構成され、両短辺部が外側に略直角に折り曲げられてフランジ部２１が形成されている。また、両長辺部がハゼ折りされて接合部２２が形成されている。この接合部２２にはシングルはぜ２２ａが複数連続的に形成され、後述するダブルはぜ３２と合わせてボタンパンチスナップはぜを構成している。このシングルはぜ２２ａは、図３に示すように、接合部２２がコ字状に切断され、コ字状の切断部分が内側に折り曲げられて形成されている。 As shown in FIG. 2, the first wall plate 2 is made of a substantially rectangular plate material, and both short sides thereof are bent outward at a substantially right angle to form a flange portion 21 . Both long sides are seam-folded to form joints 22 . A plurality of single seams 22a are continuously formed in the joint portion 22, and together with a double seam 32 to be described later, constitute a button punch snap seam. As shown in FIG. 3, the single seam 22a is formed by cutting the joint 22 into a U-shape and bending the cut portion of the U-shape inward.

また、第１の壁板２の中央部には、２つに折り重ねられて外側に突出し、軸方向と略直交する方向（フランジ部２１と平行）に延びる補強リブ２３が形成されている。すなわち、図３に示すように、第１の壁板２の中央部が折り重ねられて長板状の補強リブ２３が形成されており、補強リブ２３は第１の壁板２と一体である。この補強リブ２３の位置と高さは、補強リブ付きダクト１が所定の強度、剛性が得られるように設定されている。また、補強リブ２３を形成できるように、接合部２２には、補強リブ２３の厚みの分だけ接合部２２が形成されない切欠き部２２ｂが設けられている。このような補強リブ２３の両端部つまり両接合部２２側には、第１のボルト挿入孔２３ａが形成されている。 A reinforcing rib 23 is formed in the central portion of the first wall plate 2 so as to extend in a direction substantially orthogonal to the axial direction (parallel to the flange portion 21), which is folded in two and protrudes outward. That is, as shown in FIG. 3, the central portion of the first wall plate 2 is folded to form a long plate-shaped reinforcing rib 23, and the reinforcing rib 23 is integrated with the first wall plate 2. . The position and height of the reinforcing ribs 23 are set so that the duct 1 with reinforcing ribs can obtain predetermined strength and rigidity. In addition, in order to form the reinforcing rib 23, the joint portion 22 is provided with a notch portion 22b corresponding to the thickness of the reinforcing rib 23, in which the joint portion 22 is not formed. First bolt insertion holes 23a are formed at both ends of the reinforcing rib 23, that is, at both joint portions 22 side.

第２の壁板３は、図４に示すように、略長方形の板材で構成され、両短辺部が外側に略直角に折り曲げられてフランジ部３１が形成されている。また、図５（ａ）に示すように、両長辺部がハゼ折りされてダブルはぜ３２が形成され、このダブルはぜ３２は、図５（ｂ）に示すように、第１の壁板２のシングルはぜ２２ａとかみ合う形状に形成されている。そして、第２の壁板３のダブルはぜ３２が第１の壁板２の接合部２２とはぜ接合されて、第１の壁板２と第２の壁板３とが組み付けられている。 As shown in FIG. 4, the second wall plate 3 is made of a substantially rectangular plate material, and both short sides thereof are bent outward at a substantially right angle to form a flange portion 31 . Further, as shown in FIG. 5(a), both long sides are seam-folded to form a double seam 32, and this double seam 32, as shown in FIG. The shingles of the plate 2 are shaped to mesh with the seams 22a. The double seam 32 of the second wall plate 3 is seam-joined to the joint portion 22 of the first wall plate 2 to assemble the first wall plate 2 and the second wall plate 3. .

また、第２の壁板３の中央部には、第１の壁板２と同様に、２つに折り重ねられて外側に突出し、軸方向と略直交する方向（フランジ部３１と平行）に延びる補強リブ３３が形成されている。この補強リブ３３の位置と高さは、補強リブ２３と同じに設定され、補強リブ付きダクト１の周方向に連続的に延びるように補強リブ２３、３３（壁板４、５の補強リブを含む）が形成されている。このような補強リブ３３の両端部つまり両ダブルはぜ３２側には、第２のボルト挿入孔３３ａが形成されている。 Further, in the center of the second wall plate 3, similarly to the first wall plate 2, a wall plate is folded in two and protrudes outward in a direction substantially orthogonal to the axial direction (parallel to the flange portion 31). An extending reinforcing rib 33 is formed. The position and height of this reinforcing rib 33 are set to be the same as that of the reinforcing rib 23, and the reinforcing ribs 23, 33 (the reinforcing ribs of the wall plates 4, 5) extend continuously in the circumferential direction of the duct 1 with reinforcing ribs. including) are formed. A second bolt insertion hole 33a is formed at both ends of the reinforcing rib 33, that is, on the double seam 32 side.

このような壁板２～５が組み付けられて四角い筒体が形成され、例えば、図６に示すように、第１の壁板２のフランジ部２１と第２の壁板３のフランジ部３１とにＬ字状のコーナーピース６が取り付けられる。同様に、他のフランジ間にもコーナーピース６が取り付けられる。そして、コーナーピース６の角部に形成された孔６ａにボルトを挿入することで、他のダクトなどと連結されるようになっている。 Such wall plates 2 to 5 are assembled to form a square cylindrical body. For example, as shown in FIG. An L-shaped corner piece 6 is attached to the . Similarly, corner pieces 6 are attached between other flanges. By inserting a bolt into a hole 6a formed at the corner of the corner piece 6, the corner piece 6 is connected to another duct or the like.

また、隣接する補強リブ２３、３３の端部同士を連結する連結金具７を備える。この連結金具７は、図７に示すように、略Ｌ字状の平板で、略長方形状の２つの直板部７１が略直角にアングル状に配置され、それぞれの自由端部側には連結用孔７１ａが形成されている。また、２つの直板部７１の自由端部の外側の角部が斜めにカットされて、傾斜部７１ｂが形成されている。さらに、連結金具７の角部（２つの直板部７１の交差部）の外縁７ａが円弧状に形成され、２つの直板部７１の外縁７１ｃよりも角部の外縁７ａが外側に突出するように形成されている。 It also has a connecting fitting 7 that connects the ends of the reinforcing ribs 23 and 33 adjacent to each other. As shown in FIG. 7, the connecting fitting 7 is a substantially L-shaped flat plate, and two substantially rectangular straight plate portions 71 are arranged in a substantially right angle. A hole 71a is formed. In addition, the outer corners of the free ends of the two straight plate portions 71 are obliquely cut to form inclined portions 71b. Further, the outer edges 7a of the corners (the intersections of the two straight plate portions 71) of the connecting fitting 7 are formed in an arc shape so that the outer edges 7a of the corners protrude outward beyond the outer edges 71c of the two straight plate portions 71. formed.

そして、図８に示すように、連結金具７の一方の直板部７１の連結用孔７１ａと補強リブ２３の第１のボルト挿入孔２３ａとにボルト８１を挿入し、ボルト８１にナット８２を締め付けることで、連結金具７の一端部が一方の補強リブ２３の端部にボルト締結される。同様に、連結金具７の他方の直板部７１の連結用孔７１ａと補強リブ３３の第２のボルト挿入孔３３ａとにボルト８１を挿入し、ボルト８１にナット８２を締め付けることで、連結金具７の他端部が他方の補強リブ３３の端部にボルト締結される。 Then, as shown in FIG. 8, a bolt 81 is inserted into the connecting hole 71a of one straight plate portion 71 of the connecting fitting 7 and the first bolt insertion hole 23a of the reinforcing rib 23, and a nut 82 is tightened on the bolt 81. Thus, one end of the connecting fitting 7 is bolted to one end of the reinforcing rib 23 . Similarly, by inserting a bolt 81 into the connecting hole 71a of the other straight plate portion 71 of the connecting fitting 7 and the second bolt insertion hole 33a of the reinforcing rib 33 and tightening the nut 82 on the bolt 81, the connecting fitting 7 is bolted to the end of the reinforcing rib 33 on the other side.

このようにして、隣接する補強リブ２３、３３の端部同士が連結金具７で連結されている。そして、すべての隣接する補強リブ２３、３３（壁板４、５の補強リブを含む）の端部同士が、同様にして連結金具７で連結されている。 In this way, the ends of the reinforcing ribs 23 and 33 adjacent to each other are connected by the connecting fittings 7 . The end portions of all adjacent reinforcing ribs 23, 33 (including the reinforcing ribs of the wall plates 4, 5) are similarly connected with the connecting fittings 7. As shown in FIG.

また、このような連結状態において、図８に示すように、連結金具７の角部の円弧状の外縁７ａが、補強リブ２３、３３の外縁（折り目部）よりも外側に突出するように、連結金具７が形成されている。なお、図１、図８においては、図を見やすくするために、傾斜部７１ｂを図示省略している。後述する図９、図１０においても、同様に傾斜部７１ｂを図示省略している。 Also, in such a connected state, as shown in FIG. A connecting fitting 7 is formed. 1 and 8, the inclined portion 71b is omitted for the sake of clarity. Similarly, the inclined portion 71b is omitted in FIGS. 9 and 10, which will be described later.

以上のような構成の補強リブ付きダクト１によれば、各壁板２～５の中央部を２つ折りして補強リブ２３、３３等が形成されているため、山形鋼から成る補強材をスポット溶接やリベットで取り付ける必要がない。また、連結金具７の両端部（直板部７１）を隣接する補強リブ２３、３３等の端部にボルト締結するだけで、隣接する補強リブ２３、３３等の端部同士を連結することができ、従来のように連結金具をスポット溶接する場合に比べて、労力と時間、費用を軽減することが可能となる。このように、構成が簡易で容易に製作することが可能となる。また、連結金具７が略Ｌ字状の平板で単純な形状のため、取り扱いや保管、運搬などがしやすい。 According to the duct 1 with reinforcing ribs configured as described above, since the reinforcing ribs 23, 33 and the like are formed by folding the central portions of the wall plates 2 to 5 in two, reinforcing members made of angle steel are spotted. No welding or riveting required. Further, the ends of the adjacent reinforcing ribs 23, 33, etc. can be connected by simply bolting both ends (straight plate portions 71) of the connecting fitting 7 to the ends of the adjacent reinforcing ribs 23, 33, etc. , it is possible to reduce labor, time, and cost compared to conventional spot welding of connecting fittings. In this way, the structure is simple and can be easily manufactured. In addition, since the connecting fitting 7 is a substantially L-shaped flat plate and has a simple shape, it is easy to handle, store, and transport.

しかも、連結金具７の両端部を補強リブ２３、３３等の端部にボルト締結した状態、つまり、隣接する補強リブ２３、３３等の端部同士を連結金具７で連結した状態で、連結金具７の角部の円弧状の外縁７ａが補強リブ２３、３３等の外縁よりも突出する。このため、補強リブ２３、３３等の端部・角部で手を傷つけたり外部に損傷を与えたりするのを、より確実に防止、抑制することが可能となる。 Moreover, in a state in which both ends of the connecting metal fitting 7 are bolted to the ends of the reinforcing ribs 23, 33, etc., that is, in a state in which the ends of the adjacent reinforcing ribs 23, 33, etc. are connected by the connecting metal fitting 7, the connecting metal fittings An arc-shaped outer edge 7a at the corner of 7 protrudes from the outer edges of the reinforcing ribs 23, 33 and the like. For this reason, it is possible to more reliably prevent and suppress injury to hands and external damage caused by the ends and corners of the reinforcing ribs 23, 33 and the like.

（実施の形態２）
図９は、この実施の形態に係る連結金具７の取付状態を示す斜視図である。この実施の形態では、連結金具７の一端部が一方の補強リブ２３の間に挿入されてボルト締結され、他端部が他方の補強リブ３３の間に挿入されてボルト締結される点で、実施の形態１と構成が異なり、実施の形態１と同等の構成については、同一符号を付することでその説明を省略する。 (Embodiment 2)
FIG. 9 is a perspective view showing the mounting state of the connecting fitting 7 according to this embodiment. In this embodiment, one end of the connecting fitting 7 is inserted between one reinforcing rib 23 and bolted, and the other end is inserted between the other reinforcing rib 33 and bolted. Configurations that are different from Embodiment 1 and that are equivalent to those of Embodiment 1 are denoted by the same reference numerals, and description thereof will be omitted.

すなわち、連結金具７の一方の直板部７１が第１の壁板２の補強リブ２３の間に挿入され（補強リブ２３で挟まれ）、この直板部７１の連結用孔７１ａと補強リブ２３の第１のボルト挿入孔２３ａとにボルト８１を挿入し、ボルト８１にナット８２を締め付けることで、連結金具７の一端部が一方の補強リブ２３の端部に固定される。同様に、連結金具７の他方の直板部７１が第２の壁板３の補強リブ３３の間に挿入され（補強リブ３３で挟まれ）、この直板部７１の連結用孔７１ａと補強リブ３３の第２のボルト挿入孔３３ａとにボルト８１を挿入し、ボルト８１にナット８２を締め付けることで、連結金具７の他端部が他方の補強リブ３３の端部に固定される。 That is, one straight plate portion 71 of the connecting fitting 7 is inserted between the reinforcing ribs 23 of the first wall plate 2 (sandwiched between the reinforcing ribs 23), and the connection holes 71a of the straight plate portion 71 and the reinforcing ribs 23 are inserted. By inserting a bolt 81 into the first bolt insertion hole 23 a and tightening a nut 82 on the bolt 81 , one end of the connecting fitting 7 is fixed to one end of the reinforcing rib 23 . Similarly, the other straight plate portion 71 of the connecting fitting 7 is inserted between the reinforcing ribs 33 of the second wall plate 3 (sandwiched between the reinforcing ribs 33), and the connecting hole 71a of the straight plate portion 71 and the reinforcing ribs 33 are inserted. By inserting a bolt 81 into the second bolt insertion hole 33 a and tightening a nut 82 on the bolt 81 , the other end of the connecting fitting 7 is fixed to the end of the other reinforcing rib 33 .

また、このような状態において、連結金具７の角部の円弧状の外縁７ａが、補強リブ２３、３３の外縁（折り目部）よりも外側に突出するように、連結金具７が形成されている。すなわち、隣接する補強リブ２３、３３の端部間に連結金具７の角部が配置され、この角部の円弧状の外縁７ａが、補強リブ２３、３３の外縁よりも外側に突出する。 Further, in such a state, the connecting metal fitting 7 is formed so that the circular arc-shaped outer edge 7a of the corner portion of the connecting metal fitting 7 protrudes outward beyond the outer edges (folded portions) of the reinforcing ribs 23 and 33. . That is, the corners of the connecting fittings 7 are arranged between the ends of the reinforcing ribs 23 and 33 adjacent to each other, and the arc-shaped outer edges 7a of the corners protrude outside the outer edges of the reinforcing ribs 23 and 33 .

このような実施の形態によれば、実施の形態１と同様に、各壁板２～５の中央部を２つ折りして補強リブ２３、３３等が形成されているため、山形鋼から成る補強材をスポット溶接やリベットで取り付ける必要がない。また、連結金具７の両端部（直板部７１）を隣接する補強リブ２３、３３等の間（隙間）に挿入してボルト締結するだけで、隣接する補強リブ２３、３３等の端部同士を連結することができ、従来のように連結金具をスポット溶接する場合に比べて、労力と時間、費用を軽減することが可能となる。このように、構成が簡易で容易に製作することが可能となる。 According to this embodiment, the central portions of the wall plates 2 to 5 are folded in half to form the reinforcing ribs 23, 33, etc., similarly to the first embodiment. There is no need to spot weld or rivet the material. Further, by simply inserting both ends (straight plate portions 71) of the connecting fitting 7 into the gaps between the adjacent reinforcing ribs 23, 33, etc. and fastening with bolts, the ends of the adjacent reinforcing ribs 23, 33, etc. It can be connected, and it is possible to reduce labor, time, and cost as compared with the conventional case of spot-welding the connecting fittings. In this way, the structure is simple and can be easily manufactured.

しかも、連結金具７の２つの直板部７１の自由端部に傾斜部７１ｂが形成されているため、直板部７１を補強リブ２３、３３等の間に容易に挿入することが可能となる。また、２つの直板部７１を補強リブ２３、３３等で挟んでさらにボルト締結するため、隣接する補強リブ２３、３３等の端部同士を連結金具７でより強固に連結することが可能となる。この結果、補強材としての補強リブ２３、３３等および連結金具７の強度、剛性を高めることが可能となる。 Moreover, since the free ends of the two straight plate portions 71 of the connecting fitting 7 are formed with the inclined portions 71b, the straight plate portions 71 can be easily inserted between the reinforcing ribs 23, 33 and the like. In addition, since the two straight plate portions 71 are sandwiched between the reinforcing ribs 23, 33 and the like and further bolted, it is possible to more firmly connect the ends of the adjacent reinforcing ribs 23, 33 and the like with the connecting fittings 7. . As a result, it is possible to increase the strength and rigidity of the reinforcing ribs 23, 33 and the like as reinforcing members and the connecting fittings 7. FIG.

また、連結金具７の直板部７１を補強リブ２３、３３等の間に挿入した状態、つまり、隣接する補強リブ２３、３３等の端部同士を連結金具７で連結した状態で、連結金具７の角部の円弧状の外縁７ａが補強リブ２３、３３等の外縁よりも突出する。このため、ボルト締結する前において、連結金具７の角部が補強リブ２３、３３等の間に入って連結金具７がずれてしまうのを防止、抑制することができ、隣接する補強リブ２３、３３等の端部同士を適正に連結することが可能となる。さらに、補強リブ２３、３３等の端部・角部で手を傷つけたり外部に損傷を与えたりするのを、より確実に防止、抑制することが可能となる。 Further, in a state in which the straight plate portion 71 of the connecting metal fitting 7 is inserted between the reinforcing ribs 23, 33, etc., that is, in a state in which the ends of the adjacent reinforcing ribs 23, 33, etc. are connected by the connecting metal fitting 7, the connecting metal fitting 7 is inserted. The circular arc-shaped outer edge 7a of the corner of . Therefore, it is possible to prevent or suppress the misalignment of the connecting metal fittings 7 due to the corners of the connecting metal fittings 7 entering between the reinforcing ribs 23, 33, etc. before the bolts are fastened. It becomes possible to properly connect the ends of 33 and the like. Furthermore, it is possible to more reliably prevent and suppress the end and corner portions of the reinforcing ribs 23, 33 and the like from injuring hands and damaging the outside.

（実施の形態３）
図１０は、この実施の形態に係る連結金具７の取付状態を示す斜視図である。この実施の形態では、連結金具７の一端部が一方の補強リブ２３の間に挿入され、他端部が他方の補強リブ３３の間に挿入される点で、実施の形態２と構成が異なり、実施の形態２と同等の構成については、同一符号を付することでその説明を省略する。 (Embodiment 3)
FIG. 10 is a perspective view showing the mounting state of the connecting fitting 7 according to this embodiment. This embodiment differs from the second embodiment in that one end of the connecting fitting 7 is inserted between the reinforcing ribs 23 on one side and the other end is inserted between the reinforcing ribs 33 on the other side. , the same reference numerals are assigned to the same configurations as in the second embodiment, and the description thereof will be omitted.

すなわち、連結金具７の一方の直板部７１が第１の壁板２の補強リブ２３の間に挿入されて、補強リブ２３で直板部７１が挟持されることで、連結金具７の一端部が一方の補強リブ２３の端部に固定される。同様に、連結金具７の他方の直板部７１が第２の壁板３の補強リブ３３の間に挿入されて、補強リブ３３で直板部７１が挟持されることで、連結金具７の他端部が他方の補強リブ３３の端部に固定される。 That is, one straight plate portion 71 of the connecting metal fitting 7 is inserted between the reinforcing ribs 23 of the first wall plate 2, and the straight plate portion 71 is sandwiched between the reinforcing ribs 23, so that one end portion of the connecting metal fitting 7 is It is fixed to the end of one reinforcing rib 23 . Similarly, the other straight plate portion 71 of the connecting fitting 7 is inserted between the reinforcing ribs 33 of the second wall plate 3 , and the straight plate portion 71 is sandwiched between the reinforcing ribs 33 so that the other end of the connecting fitting 7 is is fixed to the end of the other reinforcing rib 33 .

このような実施の形態によれば、連結金具７の両直板部７１を補強リブ２３、３３等で挟持するだけで、隣接する補強リブ２３、３３等の端部同士を連結することができ、ボルト締結する必要がないため、実施の形態１、２に比べてより構成が簡易でより容易に製作することが可能となる。しかも、連結金具７に連結用孔７１ａを設けたり補強リブ２３、３３等にボルト挿入孔２３ａ、３３ａ等を設けたりする必要がなく、より構成が簡易でより容易に製作することが可能となる。 According to such an embodiment, the ends of the adjacent reinforcing ribs 23, 33, etc. can be connected by simply sandwiching the straight plate portions 71 of the connecting fitting 7 between the reinforcing ribs 23, 33, etc. Since there is no need for bolt fastening, the configuration is simpler than in the first and second embodiments, making it easier to manufacture. Moreover, it is not necessary to provide the connection hole 71a in the connection metal fitting 7 or the bolt insertion holes 23a, 33a, etc. in the reinforcement ribs 23, 33, etc., so that the structure can be simpler and can be manufactured more easily. .

以上、この発明の実施の形態１～３を詳述してきたが、具体的な構成は各実施の形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計の変更等があっても、この発明に含まれる。例えば、実施の形態１～３では、ボタンパンチスナップはぜで壁板２～５を組み付けているが、その他のはぜや結合方法（溶接等）で組み付けてもよく、壁板２～５が折り重なったり展開したりする結合方法（スピンはぜ）であってもよい。 Embodiments 1 to 3 of the present invention have been described in detail above, but the specific configuration is not limited to each embodiment, and design changes, etc., are possible without departing from the gist of the present invention. is also included in the present invention. For example, in Embodiments 1 to 3, the wall plates 2 to 5 are assembled by button punch snap seams, but they may be assembled by other seams or joining methods (such as welding), and the wall plates 2 to 5 may be assembled. A binding method that folds and unfolds (spin wedge) may be used.

１補強リブ付きダクト
２～５壁板
２１フランジ部
２２接合部
２２ａシングルはぜ
２３補強リブ
２３ａ第１のボルト挿入孔
３１フランジ部
３２ダブルはぜ
３３補強リブ
３３ａ第２のボルト挿入孔
７連結金具
７ａ角部の外縁
７１直板部
７１ａ連結用孔
７１ｂ傾斜部
７１ｃ外縁
８１ボルト
８２ナット 1 duct with reinforcing ribs 2 to 5 wall plate 21 flange 22 joint 22a single seam 23 reinforcing rib 23a first bolt insertion hole 31 flange 32 double seam 33 reinforcing rib 33a second bolt insertion hole 7 connecting fitting 7a corner portion outer edge 71 straight plate portion 71a connecting hole 71b inclined portion 71c outer edge 81 bolt 82 nut

Claims

Four wall plates are joined to form a substantially square cylinder, air flows in the axial direction,
A reinforcing rib extending in a direction substantially perpendicular to the axial direction is formed by folding the central portion of each wall plate into two and protruding outward,
A connecting fitting that connects the ends of the adjacent reinforcing ribs,
The connecting fitting is a substantially L-shaped flat plate, one end of which is inserted between one of the reinforcing ribs, and the other end of which is inserted between the other of the reinforcing ribs.
A duct with reinforcing ribs, characterized by:

The outer edges of the corners of the connecting fittings are arc-shaped, and when both ends of the connecting fittings are inserted between the reinforcing ribs, the outer edges of the corners of the connecting fittings are positioned further than the outer edges of the reinforcing ribs. formed to protrude
The duct according to claim 1, characterized in that: