JP3260353B1 - Hot dip galvanizing method for I-shaped structural member - Google Patents
Hot dip galvanizing method for I-shaped structural memberInfo
- Publication number
- JP3260353B1 JP3260353B1 JP2001156403A JP2001156403A JP3260353B1 JP 3260353 B1 JP3260353 B1 JP 3260353B1 JP 2001156403 A JP2001156403 A JP 2001156403A JP 2001156403 A JP2001156403 A JP 2001156403A JP 3260353 B1 JP3260353 B1 JP 3260353B1
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- Prior art keywords
- shaped structural
- web
- structural member
- restraint
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
【要約】
【課題】I形構造部材の溶融亜鉛メッキ工程における、
はらみ、ねじれ、曲がり等の変形を防止する。
【解決手段】ウェブ1の上下にフランジ2を有するI形
構造部材を溶融亜鉛メッキするとき、ウェブ1の横方向
の端部に設けられている継手部ボルト孔5を利用して変
形防止用拘束材6をウェブ1の端部に沿って取り付け
し、ウェブを縦方向にして並列した2個の該I形構造部
材の両端を、前記拘束材に拘束板9をボルト10により
取り付けることにより連結し、この状態で溶融亜鉛メッ
キする。A hot dip galvanizing process for an I-shaped structural member is provided.
Prevents deformation such as entanglement, twisting and bending. When an I-shaped structural member having a flange (2) above and below a web (1) is hot-dip galvanized, a deformation preventing restraint is made using a joint bolt hole (5) provided at a lateral end of the web (1). A material 6 is attached along the end of the web 1, and both ends of the two I-shaped structural members arranged in parallel with the web in the longitudinal direction are connected by attaching a restraining plate 9 to the restraining material with bolts 10. In this state, hot dip galvanization is performed.
Description
【0001】[0001]
【発明の属する技術分野】本発明は、大型のI形構造部
材、特に橋梁用のI形構造部材の新規な溶融亜鉛メッキ
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel hot dip galvanizing method for large I-shaped structural members, particularly, I-shaped structural members for bridges.
【0002】[0002]
【従来の技術】各種の鋼鉄製の構造部材が種々の分野で
使用されており、例えば、橋梁主構造部材としても広
く、使用されている。橋梁主構造部材の形式としては、
鈑桁タイプ、箱形タイプ、トラス形タイプ等が知られて
いる。このうち鈑桁タイプには、図7および図8に示す
ようなウェブ(腹板ともいう)1の上下部にフランジ2
を溶接などにより取り付けたI形構造部材が用いられて
いる。そして、これらのI形構造部材は、通常図7に例
示するような垂直補剛材(スチフナーともいう)3、ま
たは図8のような水平補剛材4をウェブ1の両面または
片面に溶接することにより、I形構造部材を補強した
り、その変形を防止している。また、このようなI形構
造部材は横方向に接続して用いるために、ウェブ1の端
部部には図7に示すように多数の継手部ボルト孔5が設
けられている。2. Description of the Related Art Various types of steel structural members are used in various fields, for example, widely used as bridge main structural members. As the type of bridge main structural members,
Sheet girder type, box type, truss type and the like are known. Among them, the sheet girder type has a web 2 (also referred to as a belly plate) as shown in FIGS.
Are attached by welding or the like. These I-shaped structural members are usually welded to a vertical stiffener (also referred to as a stiffener) 3 as illustrated in FIG. 7 or a horizontal stiffener 4 as illustrated in FIG. Thereby, the I-shaped structural member is reinforced and its deformation is prevented. In order to connect and use such an I-shaped structural member in the lateral direction, a large number of joint bolt holes 5 are provided at the end of the web 1 as shown in FIG.
【0003】一方、前記I形構造部材を橋梁などとして
用いる場合には、防錆のために塗装または溶融亜鉛メッ
キ(以下、単に亜鉛メッキともいう)が施される。後者
の亜鉛メッキは、I形構造部材を溶融亜鉛メッキ浴槽
(440℃程度)に通常、4〜10分間メッキ浸漬した
後、浴槽から引き上げて温水冷却することにより行われ
る。かかる溶融亜鉛メッキによる防錆は、塗装に比べ優
れた耐食性と経済性を備えているが、以下に記述するよ
うな熱変形の大きな問題がある。[0003] On the other hand, when the I-shaped structural member is used as a bridge or the like, it is coated or hot-dip galvanized (hereinafter simply referred to as galvanized) for rust prevention. The latter zinc plating is carried out by immersing the I-shaped structural member in a hot-dip galvanizing bath (about 440 ° C.) for usually 4 to 10 minutes, and then pulling up from the bath and cooling with hot water. Rust prevention by such hot-dip galvanizing has excellent corrosion resistance and economic efficiency as compared with painting, but has a serious problem of thermal deformation as described below.
【0004】すなわち、鈑桁用のI形構造部材のような
長尺、大型で、しかも複雑な断面の薄板I形構造部材を
溶融亜鉛メッキすると、ウェブのはらみや桁のねじれ変
形、曲がり変形などの残留変形が多かれ少なかれ必ず生
じる。I形構造部材のメッキ工程においてこのような変
形は、メッキ浴浸漬時と冷却水浸漬時における熱応力に
起因して生じる。一般にメッキ過程では、I形構造部材
にはらみ変形が発生し、次の冷却過程で上下フランジに
発生する圧縮熱応力が前記はらみの影響で偏芯して作用
し、ねじれ座屈が生じるものと考えられている。That is, when a long, large, and thin cross-section I-shaped structural member, such as an I-shaped structural member for a sheet girder, is hot-dip galvanized, web skewing, torsion deformation, bending deformation, and the like of the girder are caused. More or less residual deformation always occurs. In the plating step of the I-shaped structural member, such deformation occurs due to thermal stress during immersion in a plating bath and during immersion in cooling water. Generally, it is considered that in the plating process, the I-shaped structural member undergoes entanglement deformation, and the compressive thermal stress generated in the upper and lower flanges in the next cooling process acts eccentrically under the influence of the entanglement, causing torsional buckling. Have been.
【0005】I形構造部材におけるこのようなはらみや
ねじれは、ウェブの板厚や高さ寸法、鋼材の降伏強度な
どの影響を受けて変わり、板厚が小さいほど、高さ寸法
が大きくなるほど、また降伏強度が小さくなるほど増大
する。このほかにフランジとウェブの板厚比、メッキ浸
漬条件などによっても変わり、板厚比が大きいほど、ま
たメッキ浸漬速度が遅くなるほど、これら変形は増大す
る傾向がある。特に、ねじれはこれら諸因子に加え、当
然のことながら部材が長く大型になるに従って大きくな
る。[0005] Such intrusion and twist in the I-shaped structural member change under the influence of the thickness and height of the web, the yield strength of the steel material, and the like, and as the thickness becomes smaller, the height becomes larger. Also, it increases as the yield strength decreases. In addition, the deformation varies depending on the thickness ratio of the flange and the web, the plating immersion conditions, and the like. These deformations tend to increase as the thickness ratio increases or the plating immersion speed decreases. In particular, torsion, in addition to these factors, naturally increases as the member becomes longer and larger.
【0006】従来、このようなI形構造部材の亜鉛メッ
キ時における変形防止策として、ウェブの横方向の両端
部に変形防止用拘束材(以下拘束材とする)を取り付け
る方法が提案されている。図9〜図12は、この方法を
例示したものである。図9は鈑桁に用いる両端部に拘束
材を取り付けたI形構造部材の側面図、図10は該I形
構造部材の右端部分の拡大図、図11は図9の右側面
図、図12は図11のA−A部の部分断面図である。な
お、図9のI形構造部材には、垂直補剛材3(図7参
照)または水平補剛材4(図8参照)は省略してある。Hitherto, as a measure for preventing deformation of such an I-shaped structural member at the time of galvanizing, a method has been proposed in which restraining members (hereinafter referred to as restraining members) for preventing deformation are attached to both lateral ends of a web. . 9 to 12 illustrate this method. 9 is a side view of an I-shaped structural member in which restraining members are attached to both ends used for a sheet girder, FIG. 10 is an enlarged view of a right end portion of the I-shaped structural member, FIG. 11 is a right side view of FIG. FIG. 12 is a partial cross-sectional view taken along a line AA in FIG. 11. The vertical stiffener 3 (see FIG. 7) or the horizontal stiffener 4 (see FIG. 8) is omitted from the I-shaped structural member in FIG.
【0007】かかる従来の方法は、剛性のある山形鋼か
らなる拘束材6を図11および図12に示すようにウェ
ブ1の継手部の両側に、ボルト7を通じて強固に緊締し
て取り付け、この拘束材により溶融亜鉛メッキ工程でI
形橋梁部材に発生する熱変形を防止または軽減しようと
するものである。According to the conventional method, a restraining member 6 made of a rigid angle steel is attached to both sides of a joint portion of the web 1 with bolts 7 tightly as shown in FIGS. Depending on the material used in the hot dip galvanizing process
An object of the present invention is to prevent or reduce thermal deformation generated in a bridge member.
【0008】[0008]
【発明が解決しようとする課題】上記拘束材を使用する
従来方法は、それを実施しない場合に比較すると、溶融
亜鉛メッキ工程においてウェブの端部に発生するはらみ
の変形量はかなり低減される。したがって、この拘束材
は、ウェブの端部におけるはらみ変形の有効な防止策の
一つであると言える。しかしながら、この方法はあくま
でI形構造部材の端部のはらみ防止のみであり、部材内
部のはらみやねじれ防止に対する効果はない。I形構造
部材の端部に拘束材を設けても、開放端であることには
変わりなく変形自由度を持っているために、亜鉛メッキ
工程における熱応力によりI形構造部材に発生するねじ
れや曲がり等の変形に対しては殆ど効果がなく、これら
変形は拘束材を設けないときと実質的に同様に発生して
しまう。In the conventional method using the above-mentioned restraining material, the amount of deformation of the fringes generated at the end of the web in the hot-dip galvanizing process is considerably reduced as compared with the case where the above method is not performed. Therefore, it can be said that this restraining member is one of the effective measures for preventing the entanglement deformation at the end of the web. However, this method only prevents the end of the I-shaped structural member from being entangled, and has no effect on the prevention of entanglement or twisting inside the member. Even if a restricting member is provided at the end of the I-shaped structural member, it is still an open end and has a degree of freedom of deformation. There is almost no effect on deformation such as bending, and these deformations occur substantially in the same manner as when no restraint member is provided.
【0009】I形構造部材の端部におけるウェブのはら
み変形が防止できても、ねじれや曲がりが生じている
と、I形構造部材を現場において継手で接続し橋梁を組
み立てる場合に、接続しようとするI形構造部材の継手
部の整合が難渋する。そればかりでなく、その変形量が
許容量を超えると継手の取り付けが極めて困難になるの
で、この場合には、現場にて、機械的に変形を矯正する
大掛かりな作業を余儀なくされる。[0009] Even if it is possible to prevent the web from being deformed at the end of the I-shaped structural member, if twisting or bending occurs, it is attempted to connect the I-shaped structural member when connecting the joint with a joint at the site and assembling a bridge. It is difficult to align the joints of the I-shaped structural members. In addition, if the amount of deformation exceeds the allowable amount, it becomes extremely difficult to mount the joint. In this case, a large-scale operation of mechanically correcting the deformation is required on site.
【0010】したがって、このようなねじれや曲がり
は、I形構造部材を橋梁部材として使用する場合には大
きな問題となるが、この問題は、I形構造部材自体の構
造やその構成部材の厚みや形状を工夫することも考えら
れるが、現時点では、これらの変形を防止するのは困難
である。例えば、ウェブの板厚を厚くすることは重量の
点からしても問題であるが、変形を防止のため、ウェブ
の板厚を1mm厚くしたとしても、亜鉛メッキをする限
りねじれや曲がりを回避できない。特に、ウェブの厚さ
に対して、フランジの板厚がかなり厚くなる場合(例え
ば1:3以上)や部材長さが長い場合(例えば12m以
上)は、亜鉛メッキによるI形構造部材のねじれや曲が
りおよび部材内部のはらみが一層大きくなる。[0010] Therefore, such torsion or bending becomes a serious problem when the I-shaped structural member is used as a bridge member. This problem is caused by the structure of the I-shaped structural member itself, the thickness of the constituent members, and the like. Although it is conceivable to devise the shape, it is difficult at present to prevent these deformations. For example, increasing the thickness of the web is problematic in terms of weight, but to prevent deformation, even if the thickness of the web is increased by 1 mm, twisting and bending are avoided as long as galvanizing is applied. Can not. In particular, when the thickness of the flange is considerably large (for example, 1: 3 or more) or the length of the member is long (for example, 12 m or more) with respect to the thickness of the web, the twisting of the I-shaped structural member due to galvanization, Bends and skewing inside the member are even greater.
【0011】これまでのところ、I形構造部材の亜鉛メ
ッキにおいて前記拘束材以外の実用的で有効な変形防止
方法は知られていない。このため、橋梁用の鈑桁におい
ては塗装桁に比べて亜鉛メッキ桁の方が寿命を含め優れ
ていると認識されているにも拘わらず、普及が遅れてい
るのが現状である。Until now, there is no known practical and effective deformation preventing method other than the above-mentioned restraint material in galvanizing I-shaped structural members. For this reason, at present, the spread of zinc-plated girder for bridge bridges has been delayed in spite of the fact that it is recognized that zinc-plated girder is superior in terms of service life, as compared with painted girder.
【0012】そこで、本発明は、鈑桁などに使用するI
形構造部材の亜鉛メッキにおいて、はらみ、ねじれ、曲
がりなどの変形を防止できる簡便で実用的な亜鉛メッキ
方法を提供し、また、本発明は、亜鉛メッキしたI形構
造部材を、その輸送、保管または架設をも容易にするも
のである。Accordingly, the present invention relates to a method for manufacturing a steel sheet girder such as
The present invention provides a simple and practical galvanizing method capable of preventing deformation such as entanglement, twisting and bending in galvanizing of a structural member, and the present invention provides a method of transporting and storing a galvanized I-shaped member. Or, it also facilitates erection.
【0013】[0013]
【課題を解決するための手段】本発明は、前記目的を達
成するために種々検討した結果により得られたのもので
あり、その要旨は、ウェブの上下部にフランジを有する
I形構造部材を亜鉛メッキするとき、ウェブを縦方向に
して少なくとも2個の前記I形構造部材を並列させ、該
I形構造部材の横方向の両端部を拘束板で連結した状態
で溶融亜鉛メッキ浴浸漬して亜鉛メッキすることを特徴
とするI形構造部材の溶融亜鉛メッキ方法にある。SUMMARY OF THE INVENTION The present invention has been achieved by various studies to achieve the above object, and the gist of the present invention is to galvanize an I-shaped structural member having flanges at upper and lower portions of a web. At this time, at least two of the I-shaped structural members are arranged in parallel with the web in the longitudinal direction, and the both ends of the I-shaped structural members in the horizontal direction are connected by restraining plates so as to be dipped in a galvanizing bath. Hot-dip galvanizing method for an I-shaped structural member.
【0014】さらに、本発明はウェブの横方向の端部に
設けられている継手部ボルト孔を利用して変形防止用拘
束材をウェブの端部に沿って取り付けし、該拘束材を介
して前記I形構造部材の両端を拘束板で連結することを
特徴とするI形構造部材の溶融亜鉛メッキ方法を提供す
る。Further, according to the present invention, a deformation preventing restraint is attached along the end of the web using a joint bolt hole provided at a lateral end of the web, and the restraint is inserted through the restraint. A galvanizing method for an I-shaped structural member, characterized in that both ends of the I-shaped structural member are connected by a restraint plate.
【0015】また、本発明はウェブと拘束板との間、ま
たはウェブと変形防止用拘束材との間にスペーサーを介
在させて、拘束板または変形防止用拘束材とウェブとの
間に間隙を設け、できるだけウェブの全面に溶融亜鉛メ
ッキすることを特徴とする。Further, according to the present invention, a spacer is interposed between the web and the restraint plate, or between the web and the restraint member for preventing deformation, to form a gap between the restraint plate or the restraint member for preventing deformation and the web. And hot-dip galvanizing the entire surface of the web as much as possible.
【0016】[0016]
【発明の実施の形態】本発明のI形構造部材の溶融亜鉛
メッキ方法は、従来のようにI形構造部材を単体の状態
で溶融亜鉛メッキ浴槽に浸漬し亜鉛メッキするのではな
く、少なくとも2個のI形構造部材をその横方向の両端
部を拘束板で連結した状態で溶融亜鉛メッキすることを
特徴とする。BEST MODE FOR CARRYING OUT THE INVENTION The hot dip galvanizing method for an I-shaped structural member of the present invention does not involve immersing the I-shaped structural member in a single state in a hot-dip galvanizing bath and galvanizing it. The method is characterized in that the I-shaped structural members are hot-dip galvanized with their lateral ends connected by restraining plates.
【0017】本発明がこのようにI形構造部材の端部を
拘束板で連結した状態で溶融亜鉛メッキをするのは、両
端部を拘束板で連結することにより2個のI形構造部材
を一時的に擬似単一構造体にして、各I形構造部材が溶
融亜鉛メッキ工程において熱応力を受けても、これまで
のようにI形構造部材が自由に変形ができないようにす
るためである。つまり、I形構造部材の横方向の端部を
拘束板で強固に連結することにより、メッキ工程中に熱
応力を受けて変形しようとしてもこの拘束板により互い
に制約されて変形が著しく抑制され得ることが判明し
た。The reason why the present invention performs galvanizing in a state where the ends of the I-shaped structural members are connected by the restraint plates is that the two I-shaped structural members are connected by connecting the both ends by the restraint plates. This is to temporarily form a pseudo-single structure so that even if each I-shaped structural member receives a thermal stress in the hot-dip galvanizing process, the I-shaped structural member cannot be freely deformed as before. . In other words, by firmly connecting the lateral ends of the I-shaped structural member with the restraint plate, even if they are deformed by receiving thermal stress during the plating process, the restraint plates are mutually restricted and the deformation can be significantly suppressed. It has been found.
【0018】本発明における前記I形構造部材は、防錆
のための溶融亜鉛メッキが必要であり、かつ各種構造材
として所要の強度が得られる金属部材で、通常は鋼材か
ら形成されている。ウェブの上下部に、通常、溶接など
により取り付けたフランジを有する略I形の断面を有す
る長尺の薄板構造部材で、その代表的なものとして例え
ば橋梁用の鈑桁を挙げることができる。もちろん、鈑桁
以外のI形構造部材であってもよい。The I-shaped structural member according to the present invention is a metal member which requires hot-dip galvanizing for rust prevention and which can obtain required strength as various structural materials, and is usually formed of steel. A long thin plate structural member having a substantially I-shaped cross section having a flange attached to the upper and lower portions of a web usually by welding or the like, and a typical example thereof is a plate girder for a bridge. Of course, an I-shaped structural member other than the sheet girder may be used.
【0019】さらに、前記I形構造部材は溶融亜鉛メッ
キの工程で、上記したようなはらみ変形やねじれ変形等
が生じる大型のI形構造部材で、通常、部材長さが4m
以上のものが本発明にとって効果的である。そして、該
I形構造部材のウェブとフランジの厚さや寸法は、主と
して用途により適宜決めれるが、実用範囲としてはウェ
ブの厚さが5〜20mm、高さが1000〜3000m
m、またフランジの厚さが10〜50mm、幅が200
〜800mm程度のものが一般的である。The above-mentioned I-shaped structural member is a large-sized I-shaped structural member in which the above-mentioned entangled deformation or torsional deformation occurs in the hot-dip galvanizing step, and the member length is usually 4 m.
The above is effective for the present invention. The thickness and dimensions of the web and flange of the I-shaped structural member are appropriately determined mainly depending on the application, but as a practical range, the thickness of the web is 5 to 20 mm and the height is 1000 to 3000 m.
m, the thickness of the flange is 10 to 50 mm, and the width is 200
Those having a size of about 800 mm are generally used.
【0020】本発明において、連結するI形構造部材の
数は限定されないが、通常は2個のI形構造部材を連結
する。連結するI形構造部材の数が増加すると、外見上
の容積は単体のI形構造部材の2倍以上となるため、大
型の溶融亜鉛メッキ浴槽が必要になるばかりでなく、全
体の重量が著しく増すためにメッキ浴槽への搬入やその
搬出が負担増となって、溶融亜鉛メッキの作業性が悪く
なる。さらに、好ましい実施形態では、メッキ後も前記
拘束板をI形構造部材から取り外さないで、連結した状
態でI形構造部材の保管および場内運搬を行うため、連
結するI形構造部材の数が3個以上になると、これらの
面でも支障が多くなる。したがって、通常は2個のI形
構造部材を連結するのが最適である。In the present invention, the number of I-shaped structural members to be connected is not limited, but usually two I-shaped structural members are connected. As the number of connected I-shaped structural members increases, the apparent volume becomes more than twice as large as a single I-shaped structural member, so not only a large hot-dip galvanizing bath is required, but also the overall weight is significantly increased. In order to increase the load, the load into and out of the plating bath increases, and the workability of hot-dip galvanizing deteriorates. Furthermore, in a preferred embodiment, even after plating, the restraint plate is not removed from the I-shaped structural member, and the I-shaped structural member is stored and transported in the connected state, so that the number of connected I-shaped structural members is three. If the number is more than one, troubles increase in these aspects as well. Therefore, it is usually best to connect two I-shaped structural members.
【0021】また、I形構造部材を拘束板で連結する場
合は、ウェブを縦方向にして2個のI形構造部材を好ま
しくは 0.5〜1.5m、特には0.8〜 1.0mの
間隔をおいて並列させ、この状態でウェブの両端部を拘
束板により連結する。I形構造部材が鈑桁用であると
き、両端部の少なくともウェブには前記したように継手
部ボルト孔が設けられているので、この継手部のボルト
孔を利用すれば拘束板を容易に連結できる。もちろん、
このようなボルト孔がない場合には、必要に応じてかか
るボルト孔が形成される。さらに、この継手部には、前
記したように、従来から溶融亜鉛メッキ時のはらみ変形
防止策としてウェブの両端部に拘束材を取り付けること
が知られているが、本発明の最も好ましい実施態様で
は、かかる拘束材で、好ましくは山形鋼からなる拘束材
を介してI形構造部材を拘束板で連結することが特に好
ましい。この場合、拘束板の取り付けが極めて簡便とな
るとともに、拘束材自体によるはらみ変形防止効果が一
層強固に達成される。しかし、本発明では、このような
拘束材を介さないで2個のI形構造部材の両端部を拘束
板で直接に連結してもよい。When the I-shaped structural members are connected by a restraining plate, the two I-shaped structural members are preferably 0.5 to 1.5 m, particularly 0.8 to 1. The webs are arranged side by side at an interval of 0 m, and in this state, both ends of the web are connected by a restraining plate. When the I-shaped structural member is for a sheet girder, at least the webs at both ends are provided with the joint bolt holes as described above, so that the restraint plates can be easily connected by using the bolt holes of the joints. . of course,
If there is no such bolt hole, such a bolt hole is formed as needed. Further, as described above, it is conventionally known to attach constraining members to both ends of the web as a measure to prevent entanglement deformation during hot-dip galvanizing, as described above, but in the most preferred embodiment of the present invention, It is particularly preferable to connect the I-shaped structural members with a restraining plate via such a restraining material, preferably a restraining material made of angle iron. In this case, the attachment of the restraint plate becomes extremely simple, and the effect of preventing the deformation by the restraint material itself is more firmly achieved. However, in the present invention, both ends of the two I-shaped structural members may be directly connected by the restraint plate without such a restraint member.
【0022】本発明において、I形構造部材の溶融亜鉛
メッキ条件と冷却条件は、従来方法と実質的に同じもの
が使用できる。したがって、これらの条件は詳述しない
が、概説すると、メッキ条件は浴温度:435〜445
℃、メッキ浴への浸漬速度:10〜30m/分、浸漬角
度:15〜25度、引上げ速度:1〜10m/分、引上
げ角度は初期5度から最終30度に漸増するのが好まし
い。また、冷却条件は水温:60〜80℃、浸漬速度:
10〜30m/分程度、浸漬角度:20〜30度程度が
好ましく、引上げ速度と角度は任意に選ばれる。次に、
本発明を図面を参照しながら具体的に説明する。In the present invention, the hot dip galvanizing condition and the cooling condition of the I-shaped structural member can be substantially the same as those in the conventional method. Therefore, although these conditions are not described in detail, in general, the plating conditions are bath temperature: 435 to 445.
C., immersion speed in the plating bath: 10 to 30 m / min, immersion angle: 15 to 25 degrees, pulling speed: 1 to 10 m / min, and the pulling angle is preferably gradually increased from the initial 5 degrees to the final 30 degrees. The cooling conditions were as follows: water temperature: 60 to 80 ° C., immersion speed:
The immersion angle is preferably about 20 to 30 degrees, and the pulling speed and angle are arbitrarily selected. next,
The present invention will be specifically described with reference to the drawings.
【0023】図1は、2個のI形構造部材の両端を拘束
板9で連結したときの平面図である。本例は、2個の鈑
桁用のI形構造部材を図11に示した拘束材6を介して
拘束板9により連結した場合であり、図2は、図1の右
側面図、図3は図2のB−B部の断面図である。図1の
I形構造部材の左端部も該右端部と全く同じである。FIG. 1 is a plan view in which both ends of two I-shaped structural members are connected by restraint plates 9. In this example, two I-shaped structural members for sheet girder are connected by a restraining plate 9 via a restraining member 6 shown in FIG. 11, FIG. 2 is a right side view of FIG. 1, and FIG. It is sectional drawing of the BB part of FIG. The left end of the I-shaped structural member of FIG. 1 is exactly the same as the right end.
【0024】連結前の各I形構造部材は、桁を現場で横
方向に継ぎ接続するために、通常、ウェブ1の両端部分
に継手部ボルト孔(図7参照)を有している。そして、
ウェブ1のかかる継手部には、図9〜図12で詳述した
ようにウェブ1の両側に山形鋼からなる拘束材6を、あ
らかじめボルト7により強固に取り付けしておくのが好
ましい。この場合、拘束材6からもウェブのはらみ変形
の防止効果が得られるので、拘束材6は本例のようにウ
ェブ1の両側に設けるのが好ましい。なお、ウェブ1の
両側に取り付けられた前記拘束材6のうち、拘束板9を
固定する側の拘束材すなわち並列した2個のI形構造部
材の内側に位置する拘束材には、拘束板9を取り付ける
ためのボルト孔が設けられている。Each I-shaped structural member before connection usually has joint bolt holes (see FIG. 7) at both end portions of the web 1 in order to splice the girder laterally on site. And
As described in detail with reference to FIGS. 9 to 12, it is preferable that rigid members 6 made of angle steel are firmly attached to the joint portion of the web 1 with bolts 7 on both sides of the web 1 in advance. In this case, since the restraining member 6 can also obtain the effect of preventing the web from being deformed, it is preferable to provide the restraining members 6 on both sides of the web 1 as in this example. Among the restraint members 6 attached to both sides of the web 1, the restraint member on the side to which the restraint plate 9 is fixed, that is, the restraint member located inside the two parallel I-shaped structural members is provided with the restraint plate 9. There is a bolt hole for attaching a.
【0025】また、拘束材6がウェブ1に密着すると、
この部分のウェブは拘束材6で覆われてしまい溶融亜鉛
メッキがされなくなるので、拘束材をウェブから隔置し
てウェブのできるだけ全面が溶融亜鉛メッキされるよう
にするために、本例ではウェブ1と拘束材6との間にス
ペーサーとしてパイプワッシャー8を挿入している。図
6はこのパイプワッシャー8の一例であり、パイプ体の
端部四方に直径が好ましくは5〜15mmの亜鉛流出用
の半円孔12が便宜的に設けられている。なお、このパ
イプワッシャー8は拘束材6に仮付け溶接してもよい。When the restricting member 6 comes into close contact with the web 1,
This portion of the web is covered with the restraining material 6 and cannot be hot-dip galvanized. Therefore, in order to separate the restraining material from the web so that the entire surface of the web can be hot-dip galvanized, in this example, the web is hot-dip galvanized. A pipe washer 8 is inserted as a spacer between 1 and the restraining member 6. FIG. 6 shows an example of the pipe washer 8. A semicircular hole 12 for zinc outflow, preferably having a diameter of preferably 5 to 15 mm, is provided on the four ends of the pipe body for convenience. The pipe washer 8 may be tack-welded to the restraining member 6.
【0026】図5は、本例の拘束板9を示したものであ
る。通常拘束板9は鋼鉄製の四角形の厚板から形成され
ており、この拘束板9の両端部には、前記拘束材6のボ
ルト孔の位置に合わせてボルト孔11が設けられてい
る。ここで、拘束板9の高さは連結するI形構造部材の
ウェブ1の高さと実質的に同じであり、横幅は適宜決め
ることができるが、この横幅により連結する2個のI形
構造部材の間隔が規定される。この拘束板の横幅が大き
過ぎると連結後のI形構造部材の幅が不必要に大きくな
り、溶融亜鉛メッキ浴槽の大きさやメッキ後の保管スペ
ース、場内運搬などに影響を与える。一方、横幅が小さ
過ぎると、拘束板を構造部材に取り付ける際の作業性が
悪くなるとともに、メッキ浴に浸漬させる際の抵抗が大
きくなり、構造部材のメッキ浴への浸漬速度を小さくせ
ざるを得ない場合がある。メッキ浴への浸漬速度が小さ
いと構造部材に生じるねじれ量が増大してしまう。これ
らを勘案して、拘束板9の横幅は通常50〜150cm
程度である。FIG. 5 shows the restraint plate 9 of this embodiment. Normally, the restraint plate 9 is formed of a steel square thick plate, and bolt holes 11 are provided at both ends of the restraint plate 9 in accordance with the positions of the bolt holes of the restraint member 6. Here, the height of the restraint plate 9 is substantially the same as the height of the web 1 of the I-shaped structural member to be connected, and the width can be appropriately determined. Are defined. If the width of the restraint plate is too large, the width of the I-shaped structural member after connection becomes unnecessarily large, which affects the size of the hot-dip galvanizing bath, the storage space after plating, and the transportation in the factory. On the other hand, if the width is too small, the workability at the time of attaching the restraining plate to the structural member becomes worse, and the resistance when immersing in the plating bath increases, and the immersion speed of the structural member into the plating bath must be reduced. May not get. If the immersion speed in the plating bath is low, the amount of twist generated in the structural member increases. In consideration of these, the width of the restraint plate 9 is usually 50 to 150 cm.
It is about.
【0027】拘束板9の厚さは、溶融亜鉛メッキ工程で
発生する応力に対抗できる強度が得られるように決め
る。この厚さが小さいと、所要の強度が得られないため
に、溶融亜鉛メッキ工程の熱応力により拘束板が変形
し、I形構造部材に生じる、はらみ、ねじれ、曲がり等
の変形を十分に抑制できない。しかし、I形構造部材の
変形が主に部材長さ、ウェブ厚及びフランジ厚などに依
拠しているので、拘束板9の厚さはI形構造部材の設計
仕様に基づいて決めるのが実際的である。橋梁用のI形
構造部材を連結する拘束板の場合、その厚さは好ましく
は10〜50mmである。The thickness of the restraint plate 9 is determined so as to obtain a strength that can withstand the stress generated in the hot-dip galvanizing process. If the thickness is small, the required strength cannot be obtained, so that the restraint plate is deformed due to the thermal stress of the hot-dip galvanizing process, and the deformation such as fringing, twisting, bending, etc. occurring in the I-shaped structural member is sufficiently suppressed. Can not. However, since the deformation of the I-shaped structural member mainly depends on the member length, the web thickness, the flange thickness, etc., it is practical to determine the thickness of the restraint plate 9 based on the design specification of the I-shaped structural member. It is. In the case of a restraining plate for connecting I-shaped structural members for bridges, its thickness is preferably 10 to 50 mm.
【0028】次に、2個のI形構造部材を拘束板9で実
際に連結する方法について説明する。先ずあらかじめ端
部の継手部に拘束材6を装着した2個のI形構造部材
を、ウェブを縦方向にして拘束板9の横幅に相当する間
隔をあけて並列する。次いで前記拘束材6の内側(図3
では拘束材6の上部)に拘束板9を当接して、各I形構
造部材の拘束材6と拘束板9とをボルト10により緊締
する。緊締するボルトの数は、構造部材のサイズ、拘束
板の取り付け強度等により適宜選択すればよいが、拘束
板の上下部と中央部は重点的に固定するのが望ましい。
かかる拘束板の取り付けをI形構造部材の両側に対して
行えば、2個のI形構造部材を図1に示すように拘束板
9で連結できる。Next, a method of actually connecting the two I-shaped structural members with the restraint plate 9 will be described. First, two I-shaped structural members in which the restraining members 6 are attached to the joints at the ends in advance are arranged side by side at an interval corresponding to the width of the restraining plate 9 with the web in the vertical direction. Next, the inside of the restraining member 6 (FIG. 3)
In this case, the restraint plate 9 is brought into contact with the upper portion of the restraint member 6), and the restraint member 6 and the restraint plate 9 of each I-shaped structural member are tightened by bolts 10. The number of bolts to be tightened may be appropriately selected depending on the size of the structural member, the mounting strength of the restraint plate, and the like.
If the attachment of such a restraining plate is performed on both sides of the I-shaped structural member, the two I-shaped structural members can be connected by the restraining plate 9 as shown in FIG.
【0029】なお、ウェブの片側だけに垂直補剛材また
は水平補剛材が取り付けられているI形構造部材を組み
合わせる場合には、これらのI形構造部材を並列すると
き、前記補剛材が左右対称となるように配置するのが好
ましい。また、本例では拘束板9を拘束材6の内側に取
り付けているが、拘束材6のウェブ1への取り付け向き
を変えれば、拘束板9を拘束材6の外側に取り付けでき
る。When an I-shaped structural member in which a vertical stiffener or a horizontal stiffener is attached to only one side of the web is combined, when the I-shaped structural members are juxtaposed, the stiffener is not used. It is preferable to arrange them symmetrically. In this example, the restraint plate 9 is attached to the inside of the restraint 6, but the restraint plate 9 can be mounted to the outside of the restraint 6 by changing the mounting direction of the restraint 6 to the web 1.
【0030】図4は、本発明の他の実施態様を示す。本
例は、図から明らかのように前述の拘束材6を介さない
で、I形構造部材の両端部を拘束板9により連結する場
合である。本例の拘束板9は、両側にリブ部14が形成
されている断面コ字状の厚板で、該リブ部に設けたボル
ト孔とウェブ1の継手部ボルト孔を利用して、拘束板9
をウェブ1にボルト7により直接取り付けるように構成
されている。図中13はナット止め板である。FIG. 4 shows another embodiment of the present invention. In this example, as is apparent from the figure, both ends of the I-shaped structural member are connected by the constraint plates 9 without the intervention of the constraint members 6 described above. The restraint plate 9 of this example is a thick plate having a U-shaped cross section having ribs 14 formed on both sides, and the restraint plate 9 is formed by utilizing a bolt hole provided in the rib and a joint bolt hole of the web 1. 9
Are directly attached to the web 1 by bolts 7. In the figure, reference numeral 13 denotes a nut stopper plate.
【0031】さらに、本発明において拘束板は図3の単
板や図4の断面コ字状の厚板に限定されない。図示はし
ないが、所要の強度さえ保証されれば、例えば枠体状の
ものまたは複合パネルなども使用できる。また、I形構
造部材の両端部を拘束板で連結するだけで、実質的に目
的を達成できるが、必要に応じI形構造部材の両端部以
外の部分の例えばフランジを他の手段により固定しても
よい。Further, in the present invention, the restraint plate is not limited to the single plate shown in FIG. 3 or the thick plate having a U-shaped cross section shown in FIG. Although not shown, a frame-shaped or composite panel can be used as long as the required strength is ensured. Further, the object can be substantially achieved only by connecting both ends of the I-shaped structural member with the restraint plates. However, if necessary, for example, a flange other than both ends of the I-shaped structural member may be fixed by other means. You may.
【0032】[0032]
【実施例】(実施例1)フランジ厚が20mm、ウェブ
の高さが2400mm、ウェブ厚が12mm、ウェブの
長さが下記の表1に示される、6.7〜11.7mの橋
梁用のI形構造部材を鋼材を用いて製作した。そして、
それぞれ2個の該I形構造部材を図2および図3の方法
により、表1に示されるように、板厚が20mm又は3
0mmで横幅が80cmの鋼鉄製の拘束板で端部を連結
したものを〜の4セット製作した。これらの各I形
構造部材について常法に従って溶融亜鉛メッキした。溶
融亜鉛メッキ後に部材長さとねじれの関係を測定した。
表1はその結果を示したものである。なお、メッキ後の
上記I形構造部材は、ウェブの両面方向にねじれが生じ
るが、表1には、図13のdに見られるように、最大ね
じれを生じたウェブの片面のねじれ量を測定することに
より求めた。(Example 1) For a bridge having a flange thickness of 20 mm, a web height of 2400 mm, a web thickness of 12 mm and a web length of 6.7 to 11.7 m as shown in Table 1 below. An I-shaped structural member was manufactured using a steel material. And
As shown in Table 1, each of the two I-shaped structural members was subjected to the method shown in FIGS.
Four sets of (1) having ends connected by a steel restraining plate having a width of 0 mm and a width of 80 cm were produced. Each of these I-shaped structural members was hot-dip galvanized according to a conventional method. After the hot-dip galvanizing, the relationship between the member length and the twist was measured.
Table 1 shows the results. The I-shaped structural member after plating has twists in both directions of the web. Table 1 shows the amount of twist on one side of the web where the maximum twist occurred, as shown in FIG. I asked by doing.
【0033】[0033]
【表1】 図1から明らかなように、拘束板厚が20mm及び拘束
板厚が30mmのいずれの場合も、ねじれ量は、実用許
容範囲内の100mm未満に抑制できることがわかっ
た。また、拘束板厚が30mmの場合は、部材長さが1
1m以上と極めて大きい場合にも、ねじれ量をなお小さ
く抑制できることがわかった。[Table 1] As is clear from FIG. 1, it was found that the amount of torsion could be suppressed to less than 100 mm within the practically acceptable range in both cases where the constraint plate thickness was 20 mm and the constraint plate thickness was 30 mm. When the restraint plate thickness is 30 mm, the member length is 1 mm.
It has been found that even in the case of an extremely large length of 1 m or more, the amount of twist can be suppressed to a small value.
【0034】さらに、本発明の場合、ねじれ量に加え
て、部材のはらみ変形(ウェブの平坦度)も小さい範囲
に抑制できることがわかった。例えば、部材長さ8.8
mのI形構造部材は、表1からわかるように、ねじれ量
は42mmであるが、その場合のウェブの平坦度はH/
400(Hはウェブの高さ)であった。なお、ウェブの
平坦度は、横方向から見たウェブ両側への最大はらみ長
さでウェブの高さを除したXを求め、これをH/Xとし
て記載したもので、上記の場合、ウェブ面の最大はらみ
長さは6mmである。Furthermore, in the case of the present invention, it was found that, in addition to the amount of twist, the deformation of the members (flatness of the web) can be suppressed to a small range. For example, member length 8.8
As can be seen from Table 1, the I-shaped structural member having an amount of twist of 42 mm has a flatness of the web of H /
400 (H is the height of the web). Note that the flatness of the web is obtained by dividing the height of the web by the maximum length of the web on both sides as viewed from the lateral direction, and expressing this as H / X. Has a maximum length of 6 mm.
【0035】他方、本発明の方法を従来方法と比較する
ため、部材長さ8.8mのI形構造部材を図11および
図12の拘束材だけを取り付けた従来方法で本実施例と
同じ条件で溶融亜鉛メッキし、メッキ後にねじれ量およ
びウェブの平坦度を測定したところ、ねじれ量は130
mm、ウェブの平坦度はH/229であった。これから
して、本発明の方法は、従来方法に比べて溶融亜鉛メッ
キ工程における変形を著しく減少できることがわかる。On the other hand, in order to compare the method of the present invention with the conventional method, an I-shaped structural member having a member length of 8.8 m was subjected to the same conditions as those of the present embodiment in the conventional method in which only the restraining members shown in FIGS. When the amount of twist and the flatness of the web were measured after plating, the amount of twist was 130.
mm, and the flatness of the web was H / 229. From this, it can be seen that the method of the present invention can significantly reduce the deformation in the hot-dip galvanizing process as compared with the conventional method.
【0036】(実施例2)実施例1の部材長さ8.8m
のI形構造部材についてフランジの厚さを変え、このI
形構造部材を実施例1と同じ方法により板厚が20mm
と30mmの鋼鉄製の拘束板で、並列した2個の両端部
を連結した状態で溶融亜鉛メッキした。メッキ後にウェ
ブ厚とフランジ厚の比およびねじれの関係について調査
した。その結果を表2に示す。ねじれ量の測定方法は実
施例1と同じである。(Embodiment 2) The member length of Embodiment 1 is 8.8 m.
The thickness of the flange was changed for the I-shaped structural member of
The thickness of the shaped structural member is 20 mm by the same method as in the first embodiment.
And a 30 mm steel restraining plate, hot-dip galvanizing with the two parallel end portions connected. After plating, the relationship between the ratio of the web thickness to the flange thickness and the twist was investigated. Table 2 shows the results. The method of measuring the amount of twist is the same as in the first embodiment.
【0037】[0037]
【表2】 表2から、板厚が20mmの拘束板及び板厚が30mm
の拘束板のいずれの場合も、ねじれ量は実用適許容範囲
内の100mm未満に抑制できることが確認できた。ま
た、ウェブ厚とフランジ厚の比がねじれ量と密接な関係
を有し、フランジ厚が大きいほど、ねじれ量は大きくな
るが、板厚が30mmの拘束板は、板厚が20mmの拘
束板に比べて、より大きいねじれ抑制効果を有すること
がわかった。[Table 2] From Table 2, the constraint plate having a plate thickness of 20 mm and the plate thickness of 30 mm
In each case, it was confirmed that the amount of twist could be suppressed to less than 100 mm within the practically acceptable range. Also, the ratio of the web thickness to the flange thickness has a close relationship with the amount of torsion, and the greater the flange thickness, the greater the amount of torsion, but a 30 mm thick restraint plate becomes a 20 mm thick restraint plate. In comparison, it was found to have a greater torsional suppression effect.
【0038】[0038]
【発明の効果】本発明は、以上説明したように溶融亜鉛
メッキする少なくとも2個のI形構造部材の端部を、拘
束板で強固に連結して擬似単一構造体を形成し、この状
態で溶融亜鉛メッキするので、各I形構造部材は溶融亜
鉛メッキ工程で熱応力を受けて変形しようとしても、前
記の単一構造体のために変形が抑制され、はらみ、ねじ
れ、曲がり等の変形を著しく防止または減少させること
ができる。とりわけ、これらの変形が最も生じやすく、
かつ継手部としてこれらの変形防止が他部分より強く要
求されるI形構造部材の端部を拘束板で連結ことによ
り、従来方法で解決できなかった前記変形を極めて効果
的に許容範囲内に減少させることができる。According to the present invention, as described above, the ends of at least two I-shaped structural members to be hot-dip galvanized are firmly connected with a restraining plate to form a pseudo unitary structure. Since each of the I-shaped structural members is deformed due to thermal stress in the hot-dip galvanizing process, the deformation is suppressed due to the single structure, and the deformation such as entanglement, twisting, bending, etc. Can be significantly prevented or reduced. Above all, these deformations are most likely to occur,
In addition, by connecting the ends of the I-shaped structural members, which are more strongly required to prevent the deformation than the other parts as joints, with a restraining plate, the deformation, which could not be solved by the conventional method, can be reduced extremely effectively to an allowable range. Can be done.
【0039】また、拘束板によるI形構造部材の端部連
結は、継手部ボルト孔を利用することにより簡便かつ強
固に行うことができるとともに、この継手部に従来方法
として知られている拘束材を装着し、この拘束材を介し
て拘束板で連結すると、連結作業が容易となるばかりで
なく、前記拘束材による変形防止効果も加算されるので
一層好ましい。Further, the connection of the end of the I-shaped structural member by the restraining plate can be performed simply and firmly by utilizing the bolt holes of the joint portion. It is more preferable to attach and connect with a restraining plate via the restraining material, because not only the connecting operation becomes easy, but also the deformation preventing effect by the restraining material is added.
【0040】さらに、本発明によれば、溶融亜鉛メッキ
後も架設するまで拘束板を取り外さないでそのままに保
持することにより、I形構造部材を単体で溶融亜鉛メッ
キする従来方法では全く得られない付加的効果が数多く
得られる。Further, according to the present invention, even after the hot-dip galvanizing, the constraining plate is not removed until the bridge is erected and is held as it is, so that the conventional method of hot-dip galvanizing the I-shaped structural member alone cannot be obtained at all. Many additional effects can be obtained.
【0041】すなわち、本発明ではI形構造部材のねじ
れが著しく小さく、また少なくとも2個のI形構造部材
が所望の間隔をおいて端部を拘束板で連結されユニット
化されているので、I形構造部材を直立した安定状態で
保管および運搬等に適応できるなど、従来方法に比べる
と予想を超える大きなメリットが得られる。表3は、本
発明の溶融亜鉛メッキ工程における変形防止以外の長所
と従来方法に対するメリットを整理しまとめたものであ
る。That is, in the present invention, the torsion of the I-shaped structural member is extremely small, and at least two I-shaped structural members are unitized with their ends connected by a restraining plate at a desired interval. Compared with the conventional method, a great merit that is larger than expected can be obtained, for example, the shape structural member can be stored and transported in an upright stable state. Table 3 summarizes the advantages of the present invention other than deformation prevention in the hot-dip galvanizing process and the advantages over the conventional method.
【0042】[0042]
【表3】 [Table 3]
【図1】本発明により得られるI形構造部材の平面図。FIG. 1 is a plan view of an I-shaped structural member obtained according to the present invention.
【図2】図1の右側面図。FIG. 2 is a right side view of FIG.
【図3】図2のB−B部の断面図。FIG. 3 is a sectional view taken along a line BB in FIG. 2;
【図4】本発明の他の実施態様における図3に相当する
断面図。FIG. 4 is a cross-sectional view corresponding to FIG. 3 in another embodiment of the present invention.
【図5】本発明における拘束板の実施例の斜視図。FIG. 5 is a perspective view of an embodiment of a restraint plate according to the present invention.
【図6】本発明におけるパイプワッシャーの斜視図。FIG. 6 is a perspective view of a pipe washer according to the present invention.
【図7】I形構造部材の実施例を示す斜視図。FIG. 7 is a perspective view showing an embodiment of an I-shaped structural member.
【図8】I形構造部材の他の実施例を示す斜視図。FIG. 8 is a perspective view showing another embodiment of the I-shaped structural member.
【図9】従来方法によるI形構造部材の正面図。FIG. 9 is a front view of an I-shaped structural member according to a conventional method.
【図10】図9の右端部の部分拡大図。FIG. 10 is a partially enlarged view of a right end portion of FIG. 9;
【図11】図9の右側面図。FIG. 11 is a right side view of FIG. 9;
【図12】図10のA−A部の断面図。FIG. 12 is a sectional view taken along the line AA in FIG. 10;
【図13】I形構造部材のねじれ量測定の説明図。FIG. 13 is an explanatory view of measuring the amount of twist of an I-shaped structural member.
1:ウェブ 2:フランジ 5:継手部ボルト孔 6:拘束材 7:ボルト 8:パイプワッシャー 9:拘束板 10:ボルト 1: Web 2: Flange 5: Bolt hole at joint 6: Restraint material 7: Bolt 8: Pipe washer 9: Restraint plate 10: Bolt
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤本 正幸 愛媛県今治市神宮甲383 (72)発明者 柳川 浩二 広島県豊田郡本郷町大字本郷4315 (72)発明者 菊川 耕平 広島県三原市沼田西町惣定1043−30 (56)参考文献 特開 昭61−143591(JP,A) 特開 昭58−100666(JP,A) (58)調査した分野(Int.Cl.7,DB名) C23C 2/00 - 2/40 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Fujimoto 383, Jingu-ko, Imabari-shi, Ehime (72) Inventor Koji Yanagawa 4315, Hongo-cho, Hongo-cho, Toyota-gun, Hiroshima 4315 (72) Inventor Kohei Kikukawa Numata-nishimachi, Mihara-shi, Hiroshima Sojyo 1043-30 (56) References JP-A-64-143591 (JP, A) JP-A-58-100666 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 2 / 00-2/40
Claims (4)
造部材を亜鉛メッキする方法において、ウェブを縦方向
にして少なくとも2個の前記I形構造部材を並列させ、
該I形構造部材の横方向の両端部を拘束板で連結した状
態で溶融亜鉛メッキ浴に浸漬して亜鉛メッキすることを
特徴とするI形構造部材の溶融亜鉛メッキ方法。1. A method of galvanizing an I-shaped structural member having a flange on upper and lower portions of a web, comprising: arranging at least two of the I-shaped structural members with the web in a longitudinal direction;
A hot dip galvanizing method for an I-shaped structural member, wherein the I-shaped structural member is immersed in a hot-dip galvanizing bath and galvanized in a state where both lateral ends of the I-shaped structural member are connected by a restraining plate.
手部ボルト孔を利用して変形防止用拘束材をウェブの端
部に沿って取り付けし、該拘束材を介して前記I形構造
部材の両端を前記拘束板で連結する請求項1に記載のI
形構造部材の溶融亜鉛メッキ方法。2. A deformation preventing restraint is attached along the end of the web using a joint bolt hole provided at a lateral end of the web, and the I-shape is connected through the restraint. The I of claim 1, wherein both ends of a structural member are connected by the restraint plate.
Hot-dip galvanizing method for structural members.
形防止用拘束材との間にスペーサーを介在させて、拘束
板または変形防止用拘束材とウェブとの間に間隙を設け
る請求項1または2に記載のI形構造部材の溶融亜鉛メ
ッキ方法。3. A gap is provided between the restraining plate or the restraining member for preventing deformation and the web by interposing a spacer between the web and the restraining plate or between the web and the restraining member for preventing deformation. 3. The hot-dip galvanizing method for an I-shaped structural member according to 1 or 2.
項1、2または3に記載のI形構造部材の溶融亜鉛メッ
キ方法。4. The galvanizing method for an I-shaped structural member according to claim 1, wherein the I-shaped structural member is a bridge girder.
Priority Applications (2)
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JP2001156403A JP3260353B1 (en) | 2001-05-25 | 2001-05-25 | Hot dip galvanizing method for I-shaped structural member |
PCT/JP2002/005122 WO2002097153A1 (en) | 2001-05-25 | 2002-05-27 | Method of hot-dip galvanizing i-shaped structural member |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001156403A JP3260353B1 (en) | 2001-05-25 | 2001-05-25 | Hot dip galvanizing method for I-shaped structural member |
Publications (2)
Publication Number | Publication Date |
---|---|
JP3260353B1 true JP3260353B1 (en) | 2002-02-25 |
JP2002348648A JP2002348648A (en) | 2002-12-04 |
Family
ID=19000413
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JP2001156403A Expired - Lifetime JP3260353B1 (en) | 2001-05-25 | 2001-05-25 | Hot dip galvanizing method for I-shaped structural member |
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Country | Link |
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JP (1) | JP3260353B1 (en) |
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2001
- 2001-05-25 JP JP2001156403A patent/JP3260353B1/en not_active Expired - Lifetime
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