JP7000604B1 - Rust prevention method for upper flange of steel girder - Google Patents

Rust prevention method for upper flange of steel girder Download PDF

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JP7000604B1
JP7000604B1 JP2021005764A JP2021005764A JP7000604B1 JP 7000604 B1 JP7000604 B1 JP 7000604B1 JP 2021005764 A JP2021005764 A JP 2021005764A JP 2021005764 A JP2021005764 A JP 2021005764A JP 7000604 B1 JP7000604 B1 JP 7000604B1
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steel girder
upper flange
flange
adhesive layer
sacrificial anticorrosion
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JP2022110384A (en
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浩二 井筒
之康 遠藤
章二 梶
崇晃 左近
康孝 田邉
新 吉田
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Dai Nippon Toryo KK
Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Abstract

【課題】工期の短縮に大きく寄与する鋼桁上フランジの防錆構造を提供する。【解決手段】この鋼桁上フランジ２１の防錆構造は、鋼桁上フランジ２１の防錆構造であって、鋼桁上フランジ２１上面に、自然電極電位が鉄より卑なる金属粉末を含む導電性粘着層を有する犠牲防食型シート４を貼り付けたものである。【選択図】図３PROBLEM TO BE SOLVED: To provide a rust-preventive structure for a flange on a steel girder which greatly contributes to shortening the construction period. The rust-preventive structure of the steel girder upper flange 21 is a rust-proof structure of the steel girder upper flange 21, and the upper surface of the steel girder upper flange 21 contains a metal powder having a natural electrode potential lower than that of iron. A sacrificial anticorrosion type sheet 4 having a sex adhesive layer is attached. [Selection diagram] Fig. 3

Description

本発明は、例えば道路橋などにおける鋼桁上フランジの防錆構造及び防錆方法に関する。 The present invention relates to a rust preventive structure and a rust preventive method for a flange on a steel girder in, for example, a road bridge.

鋼桁上のコンクリート床版の劣化に対する更新工事がある。かかる既設床版を鋼桁上フランジから剥離・撤去した後、鋼桁上フランジ表面にはコンクリート床版の一部や劣化した塗装が残っており、新たなコンクリート床版を設置する前にこれらの残存物を撤去し、鋼桁上フランジ表面に防錆処理を行う必要がある。防錆処理では、塗料が使用され、塗料が乾燥するまでは、次工程（鋼桁上フランジと新床版との隙間を埋めるモルタルの充填に必要な型枠の設置作業等）に進むことができない。 There is renewal work for deterioration of concrete decks on steel girders. After peeling and removing the existing deck from the steel girder upper flange, a part of the concrete deck and deteriorated paint remain on the surface of the steel girder upper flange, and these are left before installing a new concrete deck. It is necessary to remove the residue and apply rust prevention treatment to the surface of the upper flange of the steel girder. In the rust prevention treatment, the paint is used, and until the paint dries, it is possible to proceed to the next process (installation work of the formwork necessary for filling the mortar that fills the gap between the steel girder upper flange and the new deck). Can not.

鋼桁上フランジ上面の防錆処理方法として、防錆顔料を使用した有機ジンクリッチペイントと呼ばれる塗料を用いる方法が知られる（特許文献１等）。これは、鉄よりもイオン化傾向の高い亜鉛粉末の使用による犠牲防食機能により鉄が腐食するのを防止する方法である。 As a rust preventive treatment method for the upper surface of the upper flange of the steel girder, a method using a paint called organic zinc rich paint using a rust preventive pigment is known (Patent Document 1 and the like). This is a method of preventing iron from corroding due to the sacrificial anticorrosion function by using zinc powder, which has a higher ionization tendency than iron.

特開２０２０－１７９５６９号公報（段落［００８３］）Japanese Unexamined Patent Publication No. 2020-179569 (paragraph [0083])

ところで、防錆塗装においては、規定された防錆性能を満足するため多重塗布を行うことが一般である。しかし、この場合、塗布回毎に乾燥期間を挟む必要があるため、工程上のロスが生じるという問題があった。また、この種の塗料の多くは第４類第２石油類に該当する引火性液体であるため防火管理上のコストがかかる、塗装完了後の膜厚検査を必要とする、などのデメリットがあった。また、作業条件が厳しいという難もある。例えば、気温５℃以上、湿度８５％以下の条件が必要とされ、かつ雨天等による湿潤面への塗布は不可とされているため、工程計画への影響が大きい。さらに、火気厳禁、適切な換気などの、作業環境の留意が必要である。 By the way, in rust preventive coating, it is common to perform multiple coatings in order to satisfy the specified rust preventive performance. However, in this case, since it is necessary to insert a drying period for each application, there is a problem that a loss in the process occurs. In addition, many of these types of paints are flammable liquids that fall under the category of Class 4 and Class 2 petroleum, so there are disadvantages such as high cost for fire prevention management and the need for film thickness inspection after painting is completed. rice field. There is also the difficulty that working conditions are strict. For example, conditions of a temperature of 5 ° C. or higher and a humidity of 85% or lower are required, and application to a wet surface due to rainy weather or the like is not possible, which has a great influence on the process plan. Furthermore, it is necessary to pay attention to the working environment, such as strictly prohibiting fire and proper ventilation.

本発明の目的は、上記の課題を解決し得る鋼桁上フランジの防錆方法及び防錆構造を提供するものであり、特に工期の短縮に大きく寄与することのできる鋼桁上フランジの防錆方法及び防錆構造を提供することを目的とする。 An object of the present invention is to provide a rust preventive method and a rust preventive structure for a steel girder upper flange that can solve the above problems, and in particular, a rust preventive measure for a steel girder upper flange that can greatly contribute to shortening the construction period. The purpose is to provide a method and a rust preventive structure.

上記の課題を解決するために、本発明に係る一形態の鋼桁上フランジの防錆構造は、
橋梁鋼桁上フランジ上面に、自然電極電位が鉄より卑なる金属粉末を含む、犠牲防食のための導電性粘着層を有する犠牲防食型シートを、前記橋梁鋼桁上フランジ上面に前記導電性粘着層の一方面を直接接触させた状態で貼り付けた鋼桁上フランジ上面に、自然電極電位が鉄より卑なる金属粉末を含む導電性粘着層を有する犠牲防食型シートを貼り付けたものである。
また、本発明に係る他の形態の鋼桁上フランジの防錆方法は、
橋梁鋼桁上フランジの上面に、自然電極電位が鉄より卑なる金属粉末を含む、犠牲防食のための導電性粘着層を有する犠牲防食型シートを、前記橋梁鋼桁上フランジ上面に前記導電性粘着層の一方面を直接接触させた状態で貼り付けることを有する。 In order to solve the above problems, the rust-preventive structure of the steel girder upper flange according to the present invention is
A sacrificial anticorrosion sheet having a conductive adhesive layer for sacrificial anticorrosion containing a metal powder whose natural electrode potential is lower than that of iron is placed on the upper surface of the upper flange of the bridge steel girder, and the conductive adhesive is applied to the upper surface of the upper flange of the bridge steel girder. A sacrificial anticorrosion sheet having a conductive adhesive layer containing a metal powder having a natural electrode potential lower than that of iron is attached to the upper surface of the upper flange of the steel girder attached with one surface of the layer in direct contact . ..
Further, the method for preventing rust on the upper flange of the steel girder according to another embodiment of the present invention is as follows.
A sacrificial anticorrosion sheet having a conductive adhesive layer for sacrificial anticorrosion containing a metal powder whose natural electrode potential is lower than that of iron is placed on the upper surface of the upper flange of the bridge steel girder, and the conductive sheet is provided on the upper surface of the upper flange of the bridge steel girder. It has to be attached in a state where one surface of the adhesive layer is in direct contact with each other.

本発明に係るコンクリート床版更新工事を示す斜視図である。It is a perspective view which shows the concrete deck renewal work which concerns on this invention. 貼付前犠牲防食型シート４０の断面図である。It is sectional drawing of the sacrificial anticorrosion type sheet 40 before sticking. 犠牲防食型シート４による上フランジ２１の防錆構造を示す断面図である。It is sectional drawing which shows the rust preventive structure of the upper flange 21 by the sacrificial anticorrosion type sheet 4. 貼付前犠牲防食型シート４０から離型フィルム４３を剥す様子を示す側面図である。It is a side view which shows the appearance of peeling the release film 43 from the sacrificial anticorrosion type sheet 40 before sticking. 犠牲防食型シート４の貼り付けプロセスを示す側面図である。It is a side view which shows the sticking process of the sacrificial anticorrosion type sheet 4. 無収縮モルタル漏出防止用の型枠６の設置プロセスを示す断面図である。It is sectional drawing which shows the installation process of the form 6 for preventing leakage of non-shrink mortar. 新設コンクリート床版３の設置プロセスを示す断面図である。It is sectional drawing which shows the installation process of a new concrete floor slab 3. 新設コンクリート床版３の高さ調整手段を示す断面図である。It is sectional drawing which shows the height adjusting means of a new concrete floor slab 3. 接合用スタッド７の取り付けプロセスを示す断面図である。It is sectional drawing which shows the attachment process of the joining stud 7. 無収縮モルタル５の充填プロセスを示す断面図である。It is sectional drawing which shows the filling process of the non-shrinkage mortar 5. スタッド孔８への収縮補償用コンクリートの充填プロセスを示す断面図である。It is sectional drawing which shows the filling process of the concrete for shrinkage compensation to a stud hole 8.

次に、本発明に係る実施形態を図面に基づいて説明する。
図１は本実施形態にかかるコンクリート床版更新工事を示す斜視図である。
同図において、符号２は道路橋１の鋼桁である。同図に示すように、鋼桁にはＩ桁が用いられることが多いが、箱桁、トラス桁の場合もある。更新対象であるコンクリート床版３は鋼桁２の上フランジ２１の上に設置される。コンクリート床版３の更新工事が行われる際、上フランジ２１上面に防錆機能を付与するために、その上面に犠牲防食型シート４が貼り付けられる。 Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a concrete deck renewal work according to the present embodiment.
In the figure, reference numeral 2 is a steel girder of the road bridge 1. As shown in the figure, I girders are often used for steel girders, but box girders and truss girders may also be used. The concrete deck 3 to be renewed is installed on the upper flange 21 of the steel girder 2. When the concrete floor slab 3 is renewed, a sacrificial anticorrosion sheet 4 is attached to the upper surface of the upper flange 21 in order to impart a rust preventive function.

図２は貼付前犠牲防食型シート４０の断面図、図３は犠牲防食型シート４による上フランジ２１の防錆構造を示す断面図である。
なお、図２において、４０は離型フィルム４３を含めた貼付前犠牲防食型シートを示し、４は貼付前犠牲防食型シート４０から離型フィルム４３が剥されて残った部分であり、上フランジ２１の上面に貼り付けられる部分としての犠牲防食型シート４である。 FIG. 2 is a cross-sectional view of the sacrificial anticorrosion type sheet 40 before attachment, and FIG. 3 is a cross-sectional view showing the rust preventive structure of the upper flange 21 by the sacrificial anticorrosion type sheet 4.
In FIG. 2, 40 indicates a pre-attachment sacrificial anticorrosion type sheet including the release film 43, and 4 is a portion remaining after the release film 43 is peeled off from the pre-attachment sacrifice anticorrosion type sheet 40, and the upper flange. It is a sacrificial anticorrosion type sheet 4 as a portion attached to the upper surface of 21.

上フランジ２１の上面に貼り付けられる犠牲防食型シート４は、自然電極電位が鉄より卑なる金属粉末４４を含む導電性粘着層４１を有する。導電性粘着層４１は上フランジ２１の上面に直接貼り付けられる部分であり、その厚さは例えば６００μｍ程度である。導電性粘着層４１に含まれる金属粉末４４には、亜鉛のほか、例えばアルミ二ウムなど、自然電極電位が鉄より卑なる金属の粉末を採用し得る。導電性粘着層４１の、上フランジ２１の上面に直接貼り付けられる面の反対面には、新設のコンクリート床版３の下面との隙間を埋める無収縮モルタル５と導電性粘着層４１との接触による金属粉末４４のアルカリ腐食を防止するために保護層４２が設けられている。粘着剤の種類は特に限定されないが、アクリル系粘着剤、ゴム系粘着剤、ウレタン系粘着剤、及びシリコーン系粘着剤などが挙げられる。これらは単独で使用してよいし、組み合わせて使用してもよい。保護層の種類は特に限定されず、種々の材質のフィルムなどを用いることができ、熱可塑性樹脂フィルムを用いることが好ましい。熱可塑性樹脂フィルムとしては、例えば、ポリエチレンフィルム、ポリプロピレンフィルムなどのポリオレフィン系樹脂フィルム、ＰＥＴフィルムなどのポリエステル系樹脂フィルム、アクリル樹脂フィルムなどが挙げられる。これら以外にも、例えば、エチレン－酢酸ビニル共重合体フィルム、ポリ塩化ビニル系樹脂フィルム、ポリウレタン系樹脂フィルムなどを基材として用いてもよい。 The sacrificial anticorrosion sheet 4 attached to the upper surface of the upper flange 21 has a conductive adhesive layer 41 containing a metal powder 44 whose natural electrode potential is lower than that of iron. The conductive adhesive layer 41 is a portion directly attached to the upper surface of the upper flange 21, and its thickness is, for example, about 600 μm. As the metal powder 44 contained in the conductive adhesive layer 41, in addition to zinc, a metal powder having a natural electrode potential lower than that of iron, such as aluminum, may be adopted. On the opposite surface of the conductive adhesive layer 41 that is directly attached to the upper surface of the upper flange 21, the non-shrink mortar 5 that fills the gap with the lower surface of the newly installed concrete deck 3 and the conductive adhesive layer 41 come into contact with each other. A protective layer 42 is provided in order to prevent alkaline corrosion of the metal powder 44 due to the above. The type of the pressure-sensitive adhesive is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and a silicone-based pressure-sensitive adhesive. These may be used alone or in combination. The type of the protective layer is not particularly limited, and films of various materials and the like can be used, and it is preferable to use a thermoplastic resin film. Examples of the thermoplastic resin film include a polyolefin resin film such as a polyethylene film and a polypropylene film, a polyester resin film such as a PET film, and an acrylic resin film. In addition to these, for example, an ethylene-vinyl acetate copolymer film, a polyvinyl chloride-based resin film, a polyurethane-based resin film, or the like may be used as a base material.

また、図３に示すように、上フランジ２１の上面に貼り付けられた犠牲防食型シート４は、新設のコンクリート床版３の下面との間に間詰めされた無収縮モルタル５によって上から全面的に押さえられることにより、上フランジ２１の上面への密着状態が経年的に確保され、所定の防錆機能が維持され得る。
なお、符号６は無収縮モルタル５の横からの漏れを止めるための型枠であり、独立発泡体などが利用できる。 Further, as shown in FIG. 3, the sacrificial anticorrosive sheet 4 attached to the upper surface of the upper flange 21 is entirely covered from above by the non-shrink mortar 5 sandwiched between the lower surface and the lower surface of the newly installed concrete deck 3. By being pressed down, the state of close contact with the upper surface of the upper flange 21 can be ensured over time, and a predetermined rust preventive function can be maintained.
Reference numeral 6 is a mold for stopping leakage from the side of the non-shrink mortar 5, and an independent foam or the like can be used.

次に、本実施形態の上フランジ防錆方法を説明する。
ここでは、既設の道路橋１のコンクリート床版更新工事に伴って行われる上フランジ２１の防錆方法について説明するが、新規に道路橋を建造する場合の上フランジ２１の防錆処理にも応用できる。 Next, the upper flange rust prevention method of the present embodiment will be described.
Here, the rust prevention method of the upper flange 21 performed in association with the concrete deck renewal work of the existing road bridge 1 will be described, but it is also applied to the rust prevention treatment of the upper flange 21 when constructing a new road bridge. can.

まず、撤去する既設コンクリート床版のカッターによる切断、ブレーカーによる破砕、上フランジ２１に溶接されたずれ止め用スタッドや鉄筋などの金具類の切断を行った後、グラインダーなどによって上フランジ２１の上面の素地調整を行う。 First, the existing concrete deck to be removed is cut with a cutter, crushed with a breaker, and metal fittings such as slip prevention studs and reinforcing bars welded to the upper flange 21 are cut, and then a grinder or the like is used to cut the upper surface of the upper flange 21. Adjust the substrate.

次に、上フランジ２１の上面に犠牲防食型シート４を貼り付ける。図２に示したように、貼付前犠牲防食型シート４０は、導電性粘着層４１、保護層４２及び離型フィルム４３の３層構造で構成され、この３層構造のシートをロール状にした形態で搬入される。図４、図５に示すように、貼り付け直前、貼付前犠牲防食型シート４０から離型フィルム４３を剥し、露出した導電性粘着層４１の表面を上フランジ２１の上面に直接貼り付ける。 Next, the sacrificial anticorrosion sheet 4 is attached to the upper surface of the upper flange 21. As shown in FIG. 2, the pre-attachment sacrificial anticorrosion type sheet 40 is composed of a three-layer structure of a conductive adhesive layer 41, a protective layer 42, and a release film 43, and the sheet having this three-layer structure is rolled. It is brought in in the form. As shown in FIGS. 4 and 5, the release film 43 is peeled off from the sacrificial anticorrosion type sheet 40 immediately before and before attachment, and the surface of the exposed conductive adhesive layer 41 is directly attached to the upper surface of the upper flange 21.

犠牲防食型シート４の貼り付け後、図６に示すように、フランジ２１の上面に貼り付けられた犠牲防食型シート４の上に無収縮モルタル漏出防止用の型枠６を設置する。 After attaching the sacrificial anticorrosion type sheet 4, as shown in FIG. 6, a mold 6 for preventing leakage of non-shrink mortar is installed on the sacrificial anticorrosion type sheet 4 attached to the upper surface of the flange 21.

続いて、図７、８に示すように、上フランジ２１上に新設コンクリート床版３を設置する。このとき図８に示すように、高さ調整ボルト９の調整によって新設コンクリート床版３の下面と上フランジ２１の上面との間に型枠６の高さ寸法前後の隙間ができる。なお、高さ調整ボルト９は新設コンクリート床版３に鋼桁方向において略均等な間隔を置いて設けられ、高さ調整ボルト９を回転させることによって高さ調整ボルト９の下端位置が上下し、新設コンクリート床版３の高さ位置を調整するための手段である。なお、図８は図７と鋼桁方向において異なる位置の断面図である。図８において、９１は、新設コンクリート床版３に一体に固定された高さ調整ネジである。高さ調整ボルト９は高さ調整ネジ９１のネジ穴に螺合され、先端は上フランジ２１の上面に当接するように配置される。 Subsequently, as shown in FIGS. 7 and 8, a new concrete deck 3 is installed on the upper flange 21. At this time, as shown in FIG. 8, by adjusting the height adjusting bolt 9, a gap before and after the height dimension of the form 6 is created between the lower surface of the newly installed concrete deck 3 and the upper surface of the upper flange 21. The height adjusting bolts 9 are provided on the newly installed concrete deck 3 at substantially equal intervals in the steel girder direction, and the lower end positions of the height adjusting bolts 9 are moved up and down by rotating the height adjusting bolts 9. This is a means for adjusting the height position of the new concrete deck 3. Note that FIG. 8 is a cross-sectional view at a position different from that of FIG. 7 in the steel girder direction. In FIG. 8, reference numeral 91 denotes a height adjusting screw integrally fixed to the newly installed concrete deck 3. The height adjusting bolt 9 is screwed into the screw hole of the height adjusting screw 91, and the tip thereof is arranged so as to abut on the upper surface of the upper flange 21.

次に、図９に示すように、上フランジ２１の上面の決められた位置に新設コンクリート床版３との接合用スタッド７を溶接により接合する。新設コンクリート床版３には、接合用スタッド７が挿入されるスタッド孔８が所々に設けられており、これらスタッド孔８の内部の上フランジ２１の上面に接合用スタッド７が溶接される。この際、接合用スタッド７が接合される部分の犠牲防食型シート４が熱による傷害を受けないように、接合用スタッド７の溶接部周りはカッターなどにより除去しておく。 Next, as shown in FIG. 9, the joining stud 7 with the new concrete deck 3 is joined by welding at a predetermined position on the upper surface of the upper flange 21. The new concrete deck 3 is provided with stud holes 8 into which the joining studs 7 are inserted, and the joining studs 7 are welded to the upper surface of the upper flange 21 inside the stud holes 8. At this time, the area around the welded portion of the joining stud 7 is removed by a cutter or the like so that the sacrificial anticorrosion sheet 4 at the portion where the joining stud 7 is joined is not damaged by heat.

次に、図１０に示すように、上フランジ２１の上面に貼り付けられた犠牲防食型シート４と新設コンクリート床版３の下面と間の型枠６内に無収縮モルタル５を充填する。このモルタル充填は、新設コンクリート床版３に上下貫通して設けられたスタッド孔８を使って行われる。無収縮モルタル５の充填後、図１１に示すように、スタッド孔８を収縮補償用コンクリート１０で埋める。 Next, as shown in FIG. 10, the non-shrink mortar 5 is filled in the formwork 6 between the sacrificial anticorrosion type sheet 4 attached to the upper surface of the upper flange 21 and the lower surface of the new concrete deck 3. This mortar filling is performed using the stud holes 8 provided vertically penetrating the new concrete deck 3. After filling the non-shrink mortar 5, as shown in FIG. 11, the stud hole 8 is filled with the shrink compensating concrete 10.

上記のように、本実施形態では、上フランジ２１の上面の防錆処理を防錆塗料の塗布ではなく、犠牲防食型シート４の貼り付けにより行うことによって、塗料の乾燥期間が不要となって、工期の短縮を図れる。また犠牲防食型シート４は軽量であるため運搬が容易であり、消防法上の危険物にあたらないため、気温や換気などの厳しい作業条件が不要である。さらには、廃棄処分コストも抑えられ、膜厚検査が不要であり、有機溶剤作業主任者などの資格が不要であるなどの、数々の利点がある。 As described above, in the present embodiment, the rust preventive treatment on the upper surface of the upper flange 21 is performed not by applying the rust preventive paint but by pasting the sacrificial anticorrosive type sheet 4, so that the drying period of the paint becomes unnecessary. , The construction period can be shortened. Further, since the sacrificial anticorrosion type sheet 4 is lightweight, it is easy to carry, and since it is not a dangerous substance under the Fire Service Act, strict working conditions such as temperature and ventilation are not required. Furthermore, there are many advantages such as low disposal cost, no need for film thickness inspection, and no need for qualification such as organic solvent work chief.

犠牲防食型シート４には、例えば、積水化学工業株式会社、大日本塗料株式会社製の「メタモルシート」（商願２０１９－１１９９０１号）などを用いることができる。「メタモルシート」は亜鉛粉末を含有する厚さ６００μｍの導電性粘着層を有する犠牲防食型シート４である。導電性粘着層の片側面には保護層となるバリアフィルムが貼着され、導電性粘着層の逆側面には離型フィルムが貼着されている。また、「メタモルシート」は消防法上の危険物に該当しない。 For the sacrificial anticorrosion type sheet 4, for example, "Metamol Sheet" (Commercial Application No. 2019-119901) manufactured by Sekisui Chemical Co., Ltd. and Dai Nippon Toryo Co., Ltd. can be used. The "metamol sheet" is a sacrificial anticorrosion type sheet 4 having a conductive adhesive layer having a thickness of 600 μm and containing zinc powder. A barrier film serving as a protective layer is attached to one side surface of the conductive adhesive layer, and a release film is attached to the opposite side surface of the conductive adhesive layer. In addition, "metamol sheet" does not fall under the category of dangerous goods under the Fire Service Act.

犠牲防食型シート４は鋼桁の上フランジ２１の幅全体に貼り付けられる。しかし、上フランジ２１の全幅にわたって犠牲防食型シート４を一回で貼り付けるようにすると、上フランジの上面と犠牲防食型シート４との間に空気の巻き込み部分が生じるなど、密着性が悪くなり、良好な犠牲防食機能が得られない場合がある。そこで犠牲防食型シート４の離型フィルム４３を３つの幅に分断しておき、はじめに中間の幅部分の離型フィルム４３を剥がして犠牲防食型シート４の中間の幅部分を貼り付け、続いて左右の幅部分の離型フィルム４３を剥がして貼り付けることによって、空気を巻き込むことなく良好に犠牲防食型シート４の貼り付けを行うことができる。 The sacrificial anticorrosion sheet 4 is attached to the entire width of the upper flange 21 of the steel girder. However, if the sacrificial anticorrosion sheet 4 is attached over the entire width of the upper flange 21 at one time, the adhesiveness is deteriorated, for example, an air entrainment portion is generated between the upper surface of the upper flange and the sacrificial anticorrosion sheet 4. , Good sacrificial anticorrosion function may not be obtained. Therefore, the release film 43 of the sacrificial anticorrosion type sheet 4 is divided into three widths, first the release film 43 of the intermediate width portion is peeled off, and the intermediate width portion of the sacrifice anticorrosion type sheet 4 is attached. By peeling off and attaching the release film 43 on the left and right width portions, the sacrificial anticorrosion type sheet 4 can be satisfactorily attached without entraining air.

１…道路橋
２…鋼桁
３…新設コンクリート床版
４…犠牲防食型シート
５…無収縮モルタル
６…型枠
７…接合用スタッド
８…スタッド孔
９…高さ調整ボルト
１０…収縮補償用コンクリート
２１…上フランジ
４１…導電性粘着層
４２…保護層
４３…離型フィルム
４４…金属粉末 1 ... Road bridge 2 ... Steel girder 3 ... New concrete deck 4 ... Sacrificial anticorrosion type sheet 5 ... Non-shrinkage mortar 6 ... Formwork 7 ... Joining stud 8 ... Stud hole 9 ... Height adjustment bolt 10 ... Shrinkage compensation concrete 21 ... Upper flange 41 ... Conductive adhesive layer 42 ... Protective layer 43 ... Release film 44 ... Metal powder

Claims (1)

道路橋のコンクリート床版の敷設又はその更新工事に伴って行われ、前記コンクリート床版との接合用スタッドが溶接される鋼桁上フランジの防錆方法であって、
橋梁鋼桁上フランジ上面に、自然電極電位が鉄より卑なる金属粉末を含む、犠牲防食のための導電性粘着層及び幅方向に３つに分断された剥離フィルムを有する犠牲防食型シートを、前記橋梁鋼桁上フランジ上面の全幅に前記導電性粘着層の一方面を直接接触させた状態で貼り付ける工程を有し、
前記犠牲防食型シートを前記橋梁鋼桁上フランジ上面に貼り付ける工程は、
中間の幅部分の前記剥離フィルムを剥がして前記導電性粘着層の一方面を前記橋梁鋼桁上フランジ上面に貼り付け、
続いて、左右の幅部分の前記離型フィルムを剥がして前記導電性粘着層の一方面を前記橋梁鋼桁上フランジ上面に貼り付け、
さらに、前記橋梁鋼桁上フランジ上面から前記接合用スタッドの溶接部周りの前記犠牲防食型シートを部分的に除去する
鋼桁上フランジの防錆方法。 It is a rust prevention method for the steel girder upper flange to which the studs for joining with the concrete deck are welded, which is performed along with the laying of the concrete deck of the road bridge or the renewal work thereof.
A sacrificial anticorrosion sheet having a conductive adhesive layer for sacrificial corrosion protection and a release film divided into three in the width direction, which contains a metal powder whose natural electrode potential is lower than that of iron, on the upper surface of the upper flange of the bridge steel girder. It has a step of sticking the conductive adhesive layer in direct contact with the entire width of the upper surface of the upper flange of the bridge steel girder.
The step of attaching the sacrificial anticorrosion sheet to the upper surface of the upper flange of the bridge steel girder is
The release film in the middle width portion is peeled off, and one surface of the conductive adhesive layer is attached to the upper surface of the flange on the bridge steel girder.
Subsequently, the release film of the left and right width portions is peeled off, and one surface of the conductive adhesive layer is attached to the upper surface of the flange on the bridge steel girder.
Further, the sacrificial anticorrosion sheet around the welded portion of the joining stud is partially removed from the upper surface of the flange on the bridge steel girder.
Rust prevention method for upper flange of steel girder.
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JP2019073847A (en) 2017-10-12 2019-05-16 川田建設株式会社 Method for fixing precast floor slab steel girder
JP2019127606A (en) 2018-01-22 2019-08-01 積水化学工業株式会社 ANTICORROSIve MEMBER AND ANTICORROSION METHOD
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JP2020190000A (en) 2019-05-17 2020-11-26 安治川鉄工株式会社 Structural steelwork repair method and structural steelwork repair kit

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JP2019064260A (en) 2017-09-29 2019-04-25 スリーエム イノベイティブ プロパティズ カンパニー Tracking laminate sheet for concrete structure or structure having rust part, and construction method therefor
JP2019073847A (en) 2017-10-12 2019-05-16 川田建設株式会社 Method for fixing precast floor slab steel girder
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