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JP4876211B2 - Ventilator for closed section of steel bridge - Google Patents
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JP4876211B2 - Ventilator for closed section of steel bridge - Google Patents

Ventilator for closed section of steel bridge Download PDF

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Publication number
JP4876211B2
JP4876211B2 JP2001120993A JP2001120993A JP4876211B2 JP 4876211 B2 JP4876211 B2 JP 4876211B2 JP 2001120993 A JP2001120993 A JP 2001120993A JP 2001120993 A JP2001120993 A JP 2001120993A JP 4876211 B2 JP4876211 B2 JP 4876211B2
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ventilation
section
bridge
steel bridge
manhole
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JP2002317984A (en
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久司 藤井
誠 深沢
里治 尾下
雅紀 岩崎
健 奥村
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株式会社横河ブリッジ
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/50Photovoltaic [PV] energy

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Description

【0001】
【発明の属する技術分野】
この発明は、鋼製橋梁の閉断面部の内部を強制換気する換気装置に関するものである。
【0002】
【従来の技術および発明が解決しようとする課題】
鋼製橋梁の橋桁や橋脚は、その多くの部分が閉断面部からなり、その閉断面部の内部には、水分や、有機塗料から発生するガスがこもり易い。
【0003】
それ故、その閉断面部の内部の、湿度低減による腐食の進行防止や、有機塗料から発生するガスの濃度低減による作業環境改善のためには、その閉断面部の内部の換気が望ましいということを本願発明者は見いだした。
【0004】
ところで、湿度低減および作業環境改善のために鋼製橋梁の閉断面部の内部にエア・コンディショナを設置することは既に試みられている。しかしながら、エア・コンディショナは通常、空調の効率を高めるために密閉状態で使用されるので、閉断面部の内部の有機塗料から発生するガスの濃度を低減させることはできず、しかも酸欠によって内部での作業に支障が生ずる可能性もあるといった不都合があった。
【0005】
さらに、山奥等に設けられた橋梁では、エア・コンディショナを作動させるための商用電源を確保するのが困難であるという不都合もあった。
【0006】
【課題を解決するための手段およびその作用・効果】
この発明は、上記課題を有利に解決した換気装置を提供することを目的とするものであり、この発明の鋼製橋梁の閉断面部用換気装置は、鋼製橋梁の閉断面部の内部を強制換気する換気装置において、前記鋼製橋梁の閉断面部を構成する鋼板に形成された貫通孔に換気ファンを設けるとともに、前記閉断面部を構成する鋼板に換気孔を設け、前記鋼製橋梁の近傍に、前記換気ファンのモータへの給電用に太陽電池および風力発電機の少なくとも一方を設け、前記貫通孔として、前記鋼製橋梁の橋桁および橋脚の少なくとも一方に設けられたマンホールを用いたことを特徴とするものである。
【0007】
かかる換気装置にあっては、鋼製橋梁の閉断面部を構成する鋼板に形成された貫通孔に設けた換気ファンのモータへ、前記鋼製橋梁の近傍に設けた太陽電池および風力発電機の少なくとも一方が給電し、その換気ファンが作動して、鋼製橋梁の閉断面部を構成する鋼板の貫通孔を通してその閉断面部の内部の空気を強制換気する。
【0008】
従って、この発明の換気装置によれば、閉断面部の内部の湿度を低減させて腐食の進行を防止することができるとともに、閉断面部の内部の有機塗料から発生するガスの濃度を低減させて作業環境を改善することができ、しかも閉断面部の内部の空気を強制換気するので、酸欠によって内部での作業に支障が生ずることもない。
【0009】
しかも、この発明の換気装置によれば、太陽電池および風力発電機の少なくとも一方が給電して換気ファンを作動させるので、商用電源の確保が困難な山奥等に設けられた橋梁でも不都合なく換気を行うことができる。
【0010】
また、この発明の換気装置によれば、前記貫通孔として、前記鋼製橋梁の橋桁および橋脚の少なくとも一方に設けられたマンホールを用いたことから、一般に鋼製橋梁の橋桁および橋脚には架設および整備作業用にマンホールが設けられているので、そのマンホールを利用することで、既設の鋼製橋梁に対しても橋梁本体を特に加工せずに容易に換気装置を設置することができる。この場合、そのマンホールの蓋に前記換気ファンを設けることとしても良く、これによれば、換気装置を設けた蓋を開閉可能にしておけばそのマンホールも従来通り使用することができる。
【0011】
なお、この発明の換気装置においては、前記太陽電池を展張したパネル(太陽電池パネル)を、前記換気ファンと一体的に設けることとしても良く、このようにすれば、換気ファンを取り付ける際に太陽電池パネルも一緒に取り付けることができるので、取り付け作業の時間と工数とを削減することができる。
【0012】
一方、この発明の換気装置においては、前記太陽電池を展張したパネルを、前記換気ファンと別体にして日当たりの良い位置に設けることとしても良く、このようにすれば、換気ファンの稼働率を高めることができるとともに、橋桁等の内部に換気ファンを設けてもそこに給電し得て大きな閉断面部の換気効率を高めることができる。
【0013】
また、この発明の換気装置においては、前記風力発電機を、前記換気ファンと別体にして風の通りの良い位置に設けることとしても良く、このようにすれば、上記の場合と同様、換気ファンの稼働率を高めることができるとともに、橋桁等の内部に換気ファンを設けてもそこに給電し得て大きな閉断面部の換気効率を高めることができる。
【0014】
【発明の実施の形態】
以下に、この発明の実施の形態を実施例によって、図面に基づき詳細に説明する。ここに、図1は、鋼製橋梁の橋脚の閉断面部の換気に適用したこの発明の鋼製橋梁の閉断面部用換気装置の一実施例を示す正面図、また図2(a),(b),(c)は、その実施例の換気装置を設ける橋脚の閉断面部を構成する鋼板に設けられた貫通孔としてのマンホールおよびその蓋を示す正面図、縦(垂直)断面図および横(水平)断面図、そして図3(a),(b)は、その実施例の換気装置の詳細を示す正面図および一部断面図である。
【0015】
図1中符号1は鋼製橋梁の橋脚、2は上記実施例の換気装置を示し、ここにおける橋脚1は、二本の柱状部1aと、それらを繋ぐ二本の水平な連結部1bとを具えており、それら二本の柱状部1aと二本の水平な連結部1bとは、箱型閉断面構造をなしていて閉断面部となっている。そしてそれら二本の柱状部1aと、下側の連結部1bとを構成する鋼板には各々、図2に示すように、人の出入りできる貫通孔として形成された例えば長径600mm,短径400mmの長円形状のマンホール1cと、そのマンホール1cを囲繞するように上記鋼板に溶接された長円形状の補強板1dとが設けられるとともに、通常は、そのマンホール1cを覆う長円形状の蓋1eが設けられており、蓋1eは、マンホール1cの周囲に配置された複数本のボルト1fで上記鋼板に脱着可能に取り付けられる。なお、1gは蓋1eに各々溶接されたコ字状の把手である。
【0016】
この実施例の換気装置2は、図1に示すように上記各マンホール1cに上記蓋1eの代わりに設けられているものであり、図3に示すように、マンホール1cの周囲の上記ボルト(ここでは図示せず)で上記鋼板に脱着可能に取り付けられて上記長円形状の蓋1eの代わりにマンホール1cを覆うとともに中央部に円形の貫通孔2aを有する略長方形状の蓋としての基板2bと、その貫通孔2aの位置にて橋脚内部側に位置するように基板2bに固定された換気ファン2cと、上記貫通孔2aの位置にて橋脚外部側に位置するように基板2bに固定されるとともにその下向きの開口部に防鳥網2dを張られたフード2eと、橋脚外部側に斜め上向きの姿勢で位置するようにアングル材2fおよび外枠2gを介して基板2bに固定された太陽電池パネル2hとを具えている。
【0017】
そして上記太陽電池パネル2hは、展張された多数の太陽電池ユニットを有して、例えば概略縦1140mm,横1000mmの長方形状をなしており、その太陽電池パネル2hと上記換気ファン2cの直流モータ2iとは、図示しない配線によって電気的に接続されていて、太陽電池パネル2hが光を受けて発生させた電力は直接、直流モータ2iに供給されるようになっている。
【0018】
かかる実施例の換気装置2にあっては、鋼製橋梁の橋脚1の閉断面部を構成する鋼板に形成された貫通孔としてのマンホール1cに設けた換気ファン2cの直流モータ2iへ、その橋脚1の近傍に設けた太陽電池パネル2hが給電し、その換気ファン2cが作動して、橋脚1の閉断面部を構成する鋼板のマンホール1cを通してその閉断面部の内部の空気を強制換気する。
【0019】
従って、この実施例の換気装置2によれば、橋脚1の閉断面部の内部の湿度を低減させて腐食の進行を防止することができるとともに、その閉断面部の内部の有機塗料から発生するガスの濃度を低減させて作業環境を改善することができ、しかもその閉断面部の内部の空気を強制換気するので、酸欠によって内部での作業に支障が生ずることもない。
【0020】
しかも、この実施例の換気装置2によれば、太陽電池パネル2hが給電して換気ファン2cを作動させるので、商用電源の確保が困難な山奥等に設けられた橋梁でも不都合なく換気を行うことができる。
【0021】
さらに、この実施例の換気装置2によれば、貫通孔として、鋼製橋梁の橋脚1に設けられたマンホール1cを用い、そのマンホール1cの略長方形状の蓋としての基板2bに換気ファン2cを設けていることから、一般に鋼製橋梁の橋桁および橋脚には架設および整備作業用にマンホール1cが設けられているので、そのマンホール1cを利用することで、既設の鋼製橋梁に対しても橋梁本体を特に加工せずに容易に換気装置2を設置することができ、換気装置2を設けた基板2bは脱着により開閉可能であるので、そのマンホール1cも従来通り使用することができる。
【0022】
さらに、この実施例の換気装置2によれば、太陽電池を展張したパネルである太陽電池パネル2hを基板2bを介して換気ファン2cと一体的に設けていることから、換気ファン2cを取り付ける際に太陽電池パネル2hも一緒に取り付けることができるので、取り付け作業の時間と工数とを削減することができる。
【0023】
図4(a),(b)は、この発明の鋼製橋梁の閉断面部用換気装置の他の一実施例を適用した橋桁(横桁)を床版の一部を除いて示す側面図および平面図、また図5(a),(b)は、端支点上でのその横桁の断面形状およびそこに位置する隔壁を示す縦(垂直)断面図および横(水平)断面図であり、図1中符号1は鋼製橋梁の端支点(図では左側の支点)および中間支点(図では右側の支点)となる橋脚、3は鋼製橋梁の横桁、4は鉄筋コンクリート製の床版を示す。
【0024】
図5に示すように、上記横桁3の左右両側部に位置する箱型閉断面構造の閉断面部内の、端支点としての橋脚1上の位置には、鋼板としての隔壁3aが配置されて固定され、それらの隔壁3aには、貫通孔としてのマンホール3bが設けられており、この実施例の換気装置5は、上記各マンホール3bに設けられたヒンジで開閉可能な蓋3cに形成された貫通孔の位置にて、その蓋3cに取り付けられた換気ファン5aと、上記横桁3の左右両側部に位置する箱型閉断面構造の閉断面部の側面を構成する鋼板に形成された図示しない換気孔と、上記換気ファン5aと別体にされ当該鋼製橋梁の日当たりの良い位置に南向きかつ斜め上向きに固定されてその換気ファン5aに給電する図示しない太陽電池パネルとを具えている。なお、横桁3の左右両側部に位置する箱型閉断面構造の閉断面部内には、端支点としての橋脚1上以外の位置にも所定間隔で多くの隔壁が配置されているが、それらの隔壁には中央部にマンホール3bよりも大きな貫通孔が設けられている。
【0025】
かかる実施例の換気装置5にあっては、鋼製橋梁の横桁3の閉断面部を構成する鋼板に形成された貫通孔としてのマンホール3bに設けた換気ファン5aへ、その橋梁の近傍に設けた太陽電池パネルが給電し、その換気ファン5aが作動して、横桁3の閉断面部を構成する鋼板のマンホール3bを通してその閉断面部の内部の空気を強制的に横桁3の延在方向へ流動させ、その流動する空気は上記側面の換気孔を通して外気と換気される。
【0026】
従って、この実施例の換気装置5によれば、横桁3の閉断面部の内部の湿度を低減させて腐食の進行を防止することができるとともに、その閉断面部の内部の有機塗料から発生するガスの濃度を低減させて作業環境を改善することができ、しかもその閉断面部の内部の空気を強制換気するので、酸欠によって内部での作業に支障が生ずることもない。
【0027】
しかも、この実施例の換気装置5によれば、太陽電池パネルが給電して換気ファン5aを作動させるので、商用電源の確保が困難な山奥等に設けられた橋梁でも不都合なく換気を行うことができる。
【0028】
さらに、この実施例の換気装置2によれば、貫通孔として、鋼製橋梁の横桁3に設けられたマンホール3bを用い、そのマンホール3bの蓋3cに換気ファン5aを設けていることから、一般に鋼製橋梁の橋桁および橋脚には架設および整備作業用にマンホール3bが設けられているので、そのマンホール3bを利用することで、既設の鋼製橋梁に対しても橋梁本体を特に加工せずに容易に換気装置5を設置することができ、換気装置5を設けた蓋3cはヒンジにより開閉可能であるので、そのマンホール3bも従来通り使用することができる。
【0029】
さらに、この実施例の換気装置5によれば、太陽電池パネルを換気ファン5aと別体にして当該鋼製橋梁の日当たりの良い位置に固定していることから、換気ファン5aの稼働率を高めることができるとともに、横桁3の内部にもうけた換気ファン5aに給電し得て、横桁3の大きな閉断面部に対し換気効率を高めることができる。
【0030】
先の実施例の換気装置2による換気シミュレーションの結果を以下に示す。但しここでは、換気装置2は、一般的な橋脚気積(容量)1,600m3 の橋脚モデルの二本の柱状部に1基づつ計2基設けられ、太陽電池パネル2hは南向きの高い位置に鉛直姿勢で配置されるものとし、その太陽電池パネル2hの発電容量を145Wとするとともに、換気ファン2cの直流モータ2iの消費電力容量を54Wとし、橋脚モデルを左右対称と想定して片側について計算する。
【0031】
この結果、直流モータ2iの定格電圧24Vより、換気ファン2cの定格風量は800m3 /hとなり、太陽電池パネル2hの発電容量145Wより、年間発電容量は100kW/年となる。そして直流モータ2iの消費電力容量は54Wであるので、年間では100kW/0.054kW=1,852h稼働することができる。従って、年間換気量Qは800m3 ×1,852h=1,481,600m3 /年となる。一方、想定橋脚モデルの橋脚気積(容量)は全体で1,600m3 であるので、片側では800m3 である。これらから、年間の換気回数は1,481,600m3 /800m3 =1,852回となり、一日当たりでは1,852回/365日=5回/日の換気が期待できる。
【0032】
また、設置方向・角度の違いによる換気回数の違いを計算したところ、以下の表1に示すようになった。換気回数の単位は回/日である。なお、太陽電池が絶えず日陰になる場合は、北側設置と同程度の換気回数になる。
【表1】

Figure 0004876211
【0033】
以上、図示例に基づき説明したが、この発明は上述の例に限定されるものでなく、例えば、この発明の換気装置は、橋脚と橋桁との両方に設けることもでき、換気ファンに給電する太陽電池は、パネル状でなくフィルム状にして橋梁の側面等に展張しても良い。
【0034】
またこの発明の換気装置における換気ファンへの給電は、風力発電機から行っても、太陽電池と風力発電機との両方から行っても良く、それらの場合に、風力発電機を、換気ファンと別体にして風の通りの良い位置に設けることとしても良い。
【図面の簡単な説明】
【図1】 鋼製橋梁の橋脚の閉断面部の換気に適用したこの発明の鋼製橋梁の閉断面部用換気装置の一実施例を示す正面図である。
【図2】 (a),(b),(c)は、その実施例の換気装置を設ける橋脚の閉断面部を構成する鋼板に設けられた貫通孔としてのマンホールおよびその蓋を示す正面図、縦(垂直)断面図および横(水平)断面図である。
【図3】 (a),(b)は、その実施例の換気装置の詳細を示す正面図および一部断面図である。
【図4】 (a),(b)は、この発明の鋼製橋梁の閉断面部用換気装置の他の一実施例を適用した橋桁(横桁)を床版の一部を除いて示す側面図および平面図である。
【図5】 (a),(b)は、端支点上でのその横桁の断面形状およびそこに位置する隔壁を示す縦(垂直)断面図および横(水平)断面図である。
【符号の説明】
1 橋脚
1a 柱状部
1b 連結部
1c マンホール
1d 補強板
1e 蓋
1f ボルト
1g 把手
2 換気装置
2a 貫通孔
2b 基板
2c 換気ファン
2d 防鳥網
2e フード
2f アングル材
2g 外枠
2h 太陽電池パネル
2i 直流モータ
3 横桁
3a 隔壁
3b マンホール
3c 蓋
4 床版
5 換気装置
5a 換気ファン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ventilation device for forcibly ventilating the inside of a closed cross section of a steel bridge.
[0002]
[Background Art and Problems to be Solved by the Invention]
Most of the bridge girders and piers of steel bridges are composed of closed cross sections, and moisture and gases generated from organic paint are likely to be trapped inside the closed cross sections.
[0003]
Therefore, ventilation inside the closed section is desirable to prevent the progress of corrosion due to humidity reduction inside the closed section and to improve the working environment by reducing the concentration of gas generated from organic paint. The inventor of the present application has found.
[0004]
By the way, in order to reduce the humidity and improve the working environment, it has already been attempted to install an air conditioner inside the closed cross section of the steel bridge. However, since air conditioners are normally used in a sealed state to increase the efficiency of air conditioning, it is not possible to reduce the concentration of gas generated from the organic paint inside the closed section, and due to lack of oxygen There is a disadvantage that internal work may be hindered.
[0005]
Furthermore, the bridge provided at the back of the mountain has a disadvantage that it is difficult to secure a commercial power source for operating the air conditioner.
[0006]
[Means for solving the problems and their functions and effects]
An object of the present invention is to provide a ventilation device that advantageously solves the above problems, and the ventilation device for a closed cross-section portion of a steel bridge according to the present invention provides an interior of a closed cross-section portion of a steel bridge. In the ventilating apparatus for forced ventilation, a ventilation fan is provided in a through hole formed in the steel plate constituting the closed cross section of the steel bridge, a ventilation hole is provided in the steel plate constituting the closed cross section, and the steel bridge is provided. At least one of a solar cell and a wind power generator for supplying power to the motor of the ventilation fan, and a manhole provided in at least one of the bridge girder and bridge pier of the steel bridge was used as the through hole . It is characterized by this.
[0007]
In such a ventilation device, a solar battery and a wind power generator provided in the vicinity of the steel bridge to a motor of a ventilation fan provided in a through hole formed in a steel plate constituting a closed cross section of the steel bridge. At least one of the power supplies and the ventilation fan operates to forcibly ventilate the air inside the closed cross section through the through hole of the steel plate constituting the closed cross section of the steel bridge.
[0008]
Therefore, according to the ventilator of the present invention, the humidity inside the closed cross section can be reduced to prevent the progress of corrosion, and the concentration of gas generated from the organic paint inside the closed cross section can be reduced. Thus, the working environment can be improved, and the air inside the closed cross section is forcibly ventilated, so that there is no problem in working inside due to lack of oxygen.
[0009]
Moreover, according to the ventilator of the present invention, since at least one of the solar cell and the wind power generator supplies power to operate the ventilation fan, ventilation can be performed without any inconvenience even in a bridge provided in a mountainous area where it is difficult to secure a commercial power source. It can be carried out.
[0010]
Further, according to the ventilation apparatus of the invention, the through-hole, since using a manhole provided on at least one of the bridge girder and piers of the steel bridge, commonly steel bridges bridge deck and piers erection and since manhole for maintenance work is provided, by utilizing the manhole, Ru can be installed easily ventilator without further processing bridge body even for existing steel bridges. In this case, it is good also as providing the said ventilation fan in the lid | cover of the manhole, According to this, if the lid | cover which provided the ventilation apparatus can be opened and closed, the manhole can also be used conventionally.
[0011]
In the ventilator according to the present invention, a panel (solar cell panel) in which the solar cell is extended may be provided integrally with the ventilation fan. In this way, when the ventilation fan is attached, Since the battery panel can be attached together, it is possible to reduce the time and man-hours for the attachment work.
[0012]
On the other hand, in the ventilator according to the present invention, the panel on which the solar cell is extended may be provided separately from the ventilation fan and provided at a sunny position. In addition to providing a ventilation fan in the bridge girder or the like, power can be supplied to the bridge girder and the ventilation efficiency of a large closed section can be increased.
[0013]
Further, in the ventilator of the present invention, the wind power generator may be provided separately from the ventilation fan and provided at a good position for passing the wind. The operating rate of the fan can be increased, and even if a ventilation fan is provided inside a bridge girder or the like, power can be supplied to the ventilation fan and the ventilation efficiency of a large closed section can be increased.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a front view showing an embodiment of a steel bridge ventilation device for a closed cross section of a steel bridge according to the present invention applied to ventilation of a closed cross section of a pier of a steel bridge, and FIG. (B), (c) is a front view showing a manhole as a through hole provided in a steel plate constituting a closed cross-section portion of a pier provided with the ventilation device of the embodiment and its lid, a vertical (vertical) cross-sectional view, and A horizontal (horizontal) cross-sectional view, and FIGS. 3A and 3B are a front view and a partial cross-sectional view showing details of the ventilator of the embodiment.
[0015]
In FIG. 1, reference numeral 1 denotes a steel bridge pier, 2 denotes the ventilation device of the above embodiment, and the pier 1 includes two columnar parts 1 a and two horizontal connecting parts 1 b connecting them. The two columnar portions 1a and the two horizontal connecting portions 1b have a box-shaped closed cross-sectional structure and are closed cross-sectional portions. And, as shown in FIG. 2, each of the steel plates constituting the two columnar portions 1a and the lower connecting portion 1b is formed as a through hole through which a person can enter and exit, for example, having a major axis of 600 mm and a minor axis of 400 mm. An oval manhole 1c and an oval reinforcing plate 1d welded to the steel plate so as to surround the manhole 1c are provided, and usually an oval lid 1e covering the manhole 1c is provided. The lid 1e is detachably attached to the steel plate with a plurality of bolts 1f arranged around the manhole 1c. In addition, 1g is a U-shaped handle welded to the lid 1e.
[0016]
The ventilator 2 of this embodiment is provided in place of the lid 1e in each manhole 1c as shown in FIG. 1, and the bolts (herein) around the manhole 1c as shown in FIG. And a substrate 2b as a substantially rectangular lid that is detachably attached to the steel plate and covers the manhole 1c instead of the oval lid 1e and has a circular through hole 2a in the center. The ventilation fan 2c fixed to the board 2b so as to be located inside the pier at the position of the through hole 2a, and the board 2b so as to be located outside the pier at the position of the through hole 2a. In addition, a hood 2e with a bird net 2d in its downward opening and a solar battery fixed to the substrate 2b via an angle member 2f and an outer frame 2g so as to be positioned obliquely upward on the outside of the pier And it includes a panel 2h.
[0017]
The solar cell panel 2h has a number of extended solar cell units, for example, has a rectangular shape of approximately 1140 mm in length and 1000 mm in width, and the DC motor 2i of the solar cell panel 2h and the ventilation fan 2c. Is electrically connected by a wiring (not shown), and the electric power generated by the solar cell panel 2h receiving light is directly supplied to the DC motor 2i.
[0018]
In the ventilation device 2 of this embodiment, the pier is connected to the DC motor 2i of the ventilation fan 2c provided in the manhole 1c as a through hole formed in the steel plate constituting the closed cross section of the pier 1 of the steel bridge. The solar cell panel 2h provided in the vicinity of 1 is supplied with power, and the ventilation fan 2c is operated to forcibly ventilate the air inside the closed cross section through the manhole 1c of the steel plate constituting the closed cross section of the pier 1.
[0019]
Therefore, according to the ventilator 2 of this embodiment, the humidity inside the closed cross section of the pier 1 can be reduced to prevent the progress of corrosion, and it is generated from the organic paint inside the closed cross section. The working environment can be improved by reducing the gas concentration, and the air inside the closed cross section is forcibly ventilated, so that there is no hindrance to the work inside due to lack of oxygen.
[0020]
Moreover, according to the ventilator 2 of this embodiment, the solar battery panel 2h supplies power to operate the ventilation fan 2c, so that ventilation can be performed without any inconvenience even in a bridge provided in the back of a mountain where it is difficult to secure commercial power. Can do.
[0021]
Furthermore, according to the ventilation device 2 of this embodiment, the manhole 1c provided in the pier 1 of the steel bridge is used as the through hole, and the ventilation fan 2c is attached to the substrate 2b as a substantially rectangular lid of the manhole 1c. Since the manhole 1c is generally provided in the bridge girder and pier of the steel bridge for installation and maintenance work, the bridge can be used for the existing steel bridge by using the manhole 1c. The ventilator 2 can be easily installed without specially processing the main body, and the substrate 2b provided with the ventilator 2 can be opened and closed by detachment, so that the manhole 1c can also be used as usual.
[0022]
Furthermore, according to the ventilation device 2 of this embodiment, since the solar cell panel 2h, which is a panel in which solar cells are extended, is provided integrally with the ventilation fan 2c via the substrate 2b, the ventilation fan 2c is attached. Moreover, since the solar cell panel 2h can be attached together, it is possible to reduce the time and man-hours for the attachment work.
[0023]
4 (a) and 4 (b) are side views showing a bridge girder (horizontal girder) to which another embodiment of a steel bridge ventilation device for steel bridge according to the present invention is applied, excluding a part of a floor slab. FIGS. 5A and 5B are a vertical (vertical) cross-sectional view and a horizontal (horizontal) cross-sectional view showing the cross-sectional shape of the cross beam on the end fulcrum and the partition located there, respectively. 1 in FIG. 1 is a bridge pier which becomes an end fulcrum (left fulcrum in the figure) and an intermediate fulcrum (right fulcrum in the figure), 3 is a steel bridge cross girder, and 4 is a reinforced concrete floor slab. Indicates.
[0024]
As shown in FIG. 5, partition walls 3 a as steel plates are arranged at positions on the pier 1 as end fulcrums in the closed cross section of the box type closed cross section structure located on the left and right sides of the cross beam 3. These partition walls 3a are provided with manholes 3b as through holes, and the ventilator 5 of this embodiment is formed on a lid 3c that can be opened and closed by a hinge provided in each of the manholes 3b. The illustration formed in the steel plate which comprises the ventilation fan 5a attached to the lid | cover 3c in the position of a through-hole, and the side surface of the closed cross-section part of the box-type closed cross-section structure located in the right-and-left both sides of the said cross beam 3 And a solar cell panel (not shown) that is separated from the ventilation fan 5a and fixed to the sunny position of the steel bridge in a south and obliquely upward direction to supply power to the ventilation fan 5a. . In the closed cross section of the box type closed cross section structure located on the left and right sides of the cross beam 3, many partitions are arranged at predetermined intervals at positions other than on the pier 1 as the end fulcrum. The partition wall is provided with a through hole larger than the manhole 3b at the center.
[0025]
In the ventilator 5 of this embodiment, in the vicinity of the bridge to the ventilation fan 5a provided in the manhole 3b as a through hole formed in the steel plate constituting the closed cross section of the cross beam 3 of the steel bridge. The provided solar cell panel supplies power, and the ventilation fan 5a is operated to forcibly extend the air inside the closed cross section 3 through the manhole 3b of the steel plate constituting the closed cross section of the cross beam 3. The flowing air is ventilated with the outside air through the ventilation holes on the side surface.
[0026]
Therefore, according to the ventilator 5 of this embodiment, the humidity inside the closed cross section of the cross beam 3 can be reduced to prevent the progress of corrosion, and generated from the organic paint inside the closed cross section. The working environment can be improved by reducing the concentration of the gas to be used, and the air inside the closed cross section is forcibly ventilated, so that there is no problem with the internal work due to lack of oxygen.
[0027]
In addition, according to the ventilator 5 of this embodiment, since the solar cell panel supplies power to operate the ventilation fan 5a, ventilation can be performed without any inconvenience even in a bridge provided in the back of a mountain where it is difficult to secure a commercial power source. it can.
[0028]
Furthermore, according to the ventilation device 2 of this embodiment, the manhole 3b provided in the cross beam 3 of the steel bridge is used as the through hole, and the ventilation fan 5a is provided on the lid 3c of the manhole 3b. Generally, a manhole 3b is provided in the bridge girder and pier of a steel bridge for installation and maintenance work. By using the manhole 3b, the bridge main body is not particularly processed even for an existing steel bridge. Since the ventilator 5 can be easily installed, and the lid 3c provided with the ventilator 5 can be opened and closed by a hinge, the manhole 3b can also be used as usual.
[0029]
Furthermore, according to the ventilator 5 of this embodiment, the solar cell panel is separated from the ventilation fan 5a and is fixed at a sunny position on the steel bridge, so that the operating rate of the ventilation fan 5a is increased. In addition, power can be supplied to the ventilation fan 5a provided inside the cross beam 3 and the ventilation efficiency can be increased with respect to the large closed cross section of the cross beam 3.
[0030]
The result of the ventilation simulation by the ventilator 2 of the previous embodiment is shown below. However, here, two ventilation devices 2 are provided, one in each of the two columnar portions of a pier model with a general pier air volume (capacity) of 1,600 m 3 , and the solar panel 2h is high in the south direction. Assuming that the solar panel 2h has a power generation capacity of 145W, the DC motor 2i of the ventilation fan 2c has a power consumption capacity of 54W, and the bridge pier model is symmetrical on one side Calculate about.
[0031]
As a result, the rated air volume of the ventilation fan 2c is 800 m 3 / h from the rated voltage 24V of the DC motor 2i, and the annual power generation capacity is 100 kW / year from the power generation capacity 145W of the solar cell panel 2h. Since the power consumption capacity of the DC motor 2i is 54W, it can operate 100kW / 0.054kW = 1,852h per year. Accordingly, the annual ventilation amount Q is 800 m 3 × 1,852 h = 1,481,600 m 3 / year. On the other hand, since the pier air volume (capacity) of the assumed pier model is 1,600 m 3 as a whole, it is 800 m 3 on one side. From these, ventilation number of times of the year becomes a 1,481,600m 3 / 800m 3 = 1,852 times, in one day can be expected ventilation of 1,852 times / day, 365 days a year = 5 times / day.
[0032]
Moreover, when the difference of the ventilation frequency by the difference in installation direction and angle was calculated, it came to show in the following Table 1. The unit of ventilation frequency is times / day. In addition, when the solar cell is constantly in the shade, the ventilation rate is about the same as the installation on the north side.
[Table 1]
Figure 0004876211
[0033]
Although the present invention has been described based on the illustrated example, the present invention is not limited to the above-described example. For example, the ventilator of the present invention can be provided on both the bridge pier and the bridge girder and supplies power to the ventilation fan. The solar cell may be formed in a film shape instead of a panel shape and spread on the side surface of the bridge.
[0034]
The power supply to the ventilation fan in the ventilation device of the present invention may be performed from a wind power generator or from both a solar cell and a wind power generator. In these cases, the wind power generator is connected to the ventilation fan. It is good also as a separate body and providing in the position where the wind is good.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a steel bridge ventilation device for a closed cross section of a steel bridge according to the present invention, which is applied to ventilation of a closed cross section of a pier of a steel bridge.
2 (a), (b), and (c) are front views showing a manhole as a through hole provided in a steel plate constituting a closed cross-section portion of a bridge pier in which a ventilation device of the embodiment is provided and its lid. FIG. 2 is a vertical (vertical) cross-sectional view and a horizontal (horizontal) cross-sectional view.
FIGS. 3A and 3B are a front view and a partial cross-sectional view showing details of the ventilation device of the embodiment. FIGS.
FIGS. 4A and 4B show a bridge girder (horizontal girder) to which another embodiment of a steel bridge ventilation device for a closed cross section of the present invention is applied, excluding a part of a floor slab. It is a side view and a top view.
FIGS. 5A and 5B are a vertical (vertical) cross-sectional view and a horizontal (horizontal) cross-sectional view showing a cross-sectional shape of the cross beam on the end fulcrum and a partition located there, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bridge pier 1a Column-shaped part 1b Connection part 1c Manhole 1d Reinforcement board 1e Lid 1f Bolt 1g Handle 2 Ventilation device 2a Through-hole 2b Substrate 2c Ventilation fan 2d Bird net 2e Hood 2f Angle material 2g Outer frame 2h Solar battery panel 2i DC motor 3 Cross girder 3a Bulkhead 3b Manhole 3c Lid 4 Floor slab 5 Ventilator 5a Ventilation fan

Claims (3)

鋼製橋梁の閉断面部の内部を強制換気する換気装置において、
前記鋼製橋梁の閉断面部を構成する鋼板に形成された貫通孔に換気ファンを設けるとともに、前記閉断面部を構成する鋼板に換気孔を設け、
前記鋼製橋梁の近傍に、前記換気ファンのモータへの給電用に太陽電池および風力発電機の少なくとも一方を設け
前記貫通孔として、前記鋼製橋梁の橋桁および橋脚の少なくとも一方に設けられたマンホールを用いたことを特徴とする、鋼製橋梁の閉断面部用換気装置。
In a ventilation device that forcibly ventilates the inside of a closed cross section of a steel bridge,
While providing a ventilation fan in the through hole formed in the steel plate constituting the closed cross section of the steel bridge, providing a ventilation hole in the steel plate constituting the closed cross section,
In the vicinity of the steel bridge, at least one of a solar cell and a wind power generator is provided for power supply to the motor of the ventilation fan ,
A ventilation device for a closed section of a steel bridge , wherein a manhole provided in at least one of a bridge girder and a pier of the steel bridge is used as the through hole .
前記換気ファンを、前記マンホールの蓋としての開閉可能な基板に設けたことを特徴とする、請求項に記載の鋼製橋梁の閉断面部用換気装置The ventilation device for a closed section of a steel bridge according to claim 1 , wherein the ventilation fan is provided on an openable / closable substrate as a lid of the manhole. 前記太陽電池を展張したパネルを、前記換気ファンと一体的に設けることを特徴とする、請求項1または2に記載の鋼製橋梁の閉断面部用換気装置。The ventilation device for a closed section of a steel bridge according to claim 1 or 2 , wherein a panel in which the solar cell is extended is provided integrally with the ventilation fan.
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