JP2007170045A - Reinforcing structure of steel slab and reinforcing method of steel slab - Google Patents

Reinforcing structure of steel slab and reinforcing method of steel slab Download PDF

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JP2007170045A
JP2007170045A JP2005369221A JP2005369221A JP2007170045A JP 2007170045 A JP2007170045 A JP 2007170045A JP 2005369221 A JP2005369221 A JP 2005369221A JP 2005369221 A JP2005369221 A JP 2005369221A JP 2007170045 A JP2007170045 A JP 2007170045A
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reinforcing
plate
deck plate
steel
steel slab
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JP4682839B2 (en
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Takumi Suzuki
巧 鈴木
Setsu Nozawa
摂 野澤
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Obayashi Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of a steel slab which improves rigidity and durability by a simple method without replacing the steel slab itself and carrying out execution or the like by the occupation of a road, and also to provide a reinforcing method of the steel slab. <P>SOLUTION: A plurality of U ribs 14 extended in the axial direction of a bridge are arranged in parallel at the lower surface of a deck plate 12 in the reinforcing structure of the steel slab. Shrinkage-compensating mortar 32 is filled into a space formed between the lower surface of the deck plate 12 and the U rib 14, and a reinforcing rib 24 is provided between the adjacent U ribs 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、橋梁や高架橋の床版に用いられる鋼床版の補強構造及び方法に関する。   The present invention relates to a steel slab reinforcement structure and method for use in bridges and viaduct slabs.

一般的に、橋梁や高架橋の鋼床版は、デッキプレートの下面に略Ｕ型の縦リブが溶接により固着され補強されている。しかしながら、長期間にわたってデッキプレートの上を車両等が走行すると、車両等の輪荷重によりデッキプレートの変形が繰り返され、その結果、鋼床版が損傷するという問題があった。そこで、例えば以下の特許文献１〜３に開示されるように、鋼床版の耐久性向上や損傷した床版の合理的な交換のための技術が提案されている。   In general, bridges and viaduct steel decks are reinforced by welding substantially U-shaped vertical ribs to the lower surface of the deck plate. However, when a vehicle or the like travels on the deck plate for a long period of time, there is a problem that the deck plate is repeatedly deformed by a wheel load of the vehicle or the like, resulting in damage to the steel deck. Therefore, for example, as disclosed in Patent Documents 1 to 3 below, techniques for improving the durability of a steel deck and rational replacement of a damaged deck have been proposed.

特許文献１には、デッキプレート下面と縦リブとで形成される閉断面空間内に充填材を充填する補強方法及びその鋼床版構造が開示されている。これは閉断面空間内に充填材を充填することにより、デッキプレートと縦リブとの溶接部分を補強し、当該溶接部分に生じる疲労亀裂を防止し、縦リブの断面疲労強度を向上させるものである。   Patent Document 1 discloses a reinforcing method for filling a filler in a closed cross-sectional space formed by a lower surface of a deck plate and vertical ribs, and a steel slab structure thereof. This is to reinforce the welded part between the deck plate and the vertical rib by filling the filler in the closed cross-sectional space, prevent fatigue cracks that occur in the welded part, and improve the cross-sectional fatigue strength of the vertical rib. is there.

特許文献２及び３には、縦リブ部材と、それら部材間をそれぞれ結合する結合部材と、それら結合部下側に位置する新設の横桁と、その横桁下側に位置する主桁とが、それぞれ結合又は固定できるように構成部材の形状を単純化する鋼床版の施工方法及びその鋼床版構造が開示されている。これは、現場までの搬送が容易とし、現場において合理的な組み立てを可能とするためのものである。
特開２００１−２４８１１４号公報 特開２０００−７３３１６号公報 特開２００２−１７３９１１号公報 In Patent Documents 2 and 3, a longitudinal rib member, a coupling member that couples the members, a new cross beam positioned below the coupling portion, and a main girder located below the cross beam, A construction method of a steel slab that simplifies the shape of the constituent members so that they can be respectively connected or fixed and a steel slab structure thereof are disclosed. This is to facilitate transportation to the site and enable rational assembly at the site.
JP 2001-248114 A JP 2000-73316 A JP 2002-173911 A

しかしながら、特許文献１で開示された鋼床版の補強方法及び鋼床版構造では、充填材を充填することにより鋼床版自身の荷重が増加し、その増加した荷重はデッキプレートにかかる反面、デッキプレートに作用する載荷荷重をデッキプレートのみで支えている縦リブ間には、鋼床版の剛性を向上させるための補強の手段が講じられていないために、デッキプレートの橋軸と直交する方向の構造は逆に脆弱になってしまうという問題があった。   However, in the steel slab reinforcement method and steel slab structure disclosed in Patent Document 1, the load of the steel slab itself is increased by filling the filler, while the increased load is applied to the deck plate, Between the vertical ribs that support the loading load acting on the deck plate only by the deck plate, there is no reinforcing means to improve the rigidity of the steel deck, so it is perpendicular to the bridge axis of the deck plate. On the other hand, there was a problem that the structure of the direction became weak.

また、特許文献２及び３で開示された鋼床版の施工方法及び鋼床版構造では、長期間にわたり使用され、鋼床版自体に局部的な歪みや撓みなどの変形が生じた鋼床版を構成する各部材に対し、部分的な補強や交換を行う際には、各部材の形状や寸法等を規格化できないために、適応が困難であるという問題があった。   Moreover, in the construction method and steel slab structure of the steel slab disclosed in Patent Documents 2 and 3, the steel slab is used over a long period of time, and the steel slab itself has undergone deformation such as local distortion and deflection. When performing partial reinforcement or replacement for each member constituting the member, there is a problem that adaptation is difficult because the shape, dimensions, etc. of each member cannot be standardized.

また、交換する鋼床版は、橋梁や高架橋の上面側より設置するので、デッキプレート上部の道路を占用しなければならない。そのため、工事が夜間に限定されやすく、昼間作業に比べて通行車両及び工事作業員の安全確保により多くの尽力を必要とし、また占用工事のため工区が細分化され工期が長期化する問題があった。   In addition, the steel slab to be replaced is installed from the top side of the bridge or viaduct, so the road above the deck plate must be occupied. For this reason, construction work is likely to be limited to nighttime, requiring more effort to ensure the safety of passing vehicles and construction workers compared to daytime work, and there is a problem that the construction period is subdivided due to private construction and the construction period is prolonged. It was.

本発明は、上記の点を鑑みてなされたものであり、鋼床版自体を入れ替えたり、道路を占用して施工したりすることなく、簡易な方法で、剛性及び耐久性を向上させることが可能な鋼床版の補強構造及びその補強方法を提供することを目的とする。   The present invention has been made in view of the above points, and can improve rigidity and durability by a simple method without replacing the steel slab itself or occupying the road. An object of the present invention is to provide a possible steel slab reinforcing structure and a reinforcing method thereof.

上記の目的を達成するため、本発明の鋼床版構造は、デッキプレートの下面に橋軸方向に延設された縦リブを複数並設してなる鋼床版の補強構造であって、前記デッキプレートの下面と前記縦リブとの間に形成される空間内に充填材を充填するとともに、隣接する縦リブ間に補強部材を設置したことを特徴とする（第１の発明）。
本発明による鋼床版構造によれば、デッキプレートの下面と縦リブとで形成される閉断面空間に充填材を充填することで、デッキプレートと縦リブとの継ぎ手内側の疲労亀裂の発生や閉断面空間の変形を抑制したり、橋軸方向の剛性を高めたりすることに加え、補強部材を隣接する縦リブ間に設置することによって、デッキプレートの縦リブ間にかかる載荷荷重を縦リブに伝達し、橋軸と直交する方向の剛性をも高めるので、従来の鋼床版構造と比べ、橋軸方向及び橋軸と直交する方向の２方向に対しその剛性及び耐久性が高い。 In order to achieve the above object, the steel slab structure of the present invention is a steel slab reinforcement structure in which a plurality of vertical ribs extending in the bridge axis direction are arranged in parallel on the lower surface of the deck plate, A filler is filled in a space formed between the lower surface of the deck plate and the vertical rib, and a reinforcing member is installed between adjacent vertical ribs (first invention).
According to the steel slab structure of the present invention, by filling the closed cross-sectional space formed by the bottom surface of the deck plate and the vertical ribs with filler, the occurrence of fatigue cracks inside the joint between the deck plate and the vertical ribs and In addition to suppressing the deformation of the closed cross-section space and increasing the rigidity in the bridge axis direction, by installing a reinforcing member between adjacent vertical ribs, the load applied between the vertical ribs of the deck plate can be The rigidity in the direction perpendicular to the bridge axis is also increased, so that the rigidity and durability are higher in the two directions of the bridge axis direction and the direction perpendicular to the bridge axis than the conventional steel slab structure.

第２の発明は、第１の発明において、前記補強部材は、隣接する縦リブ間に橋軸と直交する方向に設置され、その縁部が前記デッキプレートの下面と少なくとも一方の縦リブの側面とに亘って接合された板状部材であることを特徴とする。
本発明による補強部材によれば、長年使用することによって局部的な歪みや撓みなどの変形が生じた既設の鋼床版を補強する場合に、鋼床版の多少の変形に対しても当該補強部材の配置を適宜変更することにより、接合性を高く設置できる。 According to a second invention, in the first invention, the reinforcing member is installed between adjacent vertical ribs in a direction orthogonal to the bridge axis, and the edge thereof is a lower surface of the deck plate and a side surface of at least one vertical rib. It is a plate-shaped member joined over.
According to the reinforcing member of the present invention, when reinforcing an existing steel slab in which deformation such as local distortion or bending has occurred due to use for many years, the reinforcement is also applied to some deformation of the steel slab. By appropriately changing the arrangement of the members, it is possible to install with high bonding properties.

第３の発明は、第１の発明において、前記補強部材は、断面が略逆Ｕ字型の形状を有する逆Ｕ字型部材と、断面が略Ｕ字型の形状を有するＵ字型部材とを含み、前記逆Ｕ字型部材は隣接する縦リブの間に、前記略逆Ｕ字型の外側面が当該隣接する縦リブ間の内側の側面にそれぞれ当接するように設置され、前記Ｕ字型部材は、前記略逆Ｕ字型の補強部材の下方から、前記略Ｕ字型の内側面が隣接する縦リブの外側の側面にそれぞれ当接するように当該隣接する縦リブ間に跨設されることを特徴とする。
本発明による鋼床版構造によれば、輪荷重によって生じるデッキプレートの橋軸と直交する方向の歪みを、略逆Ｕ字型と略Ｕ字型との補強部材により２重に抑制することができる。 According to a third invention, in the first invention, the reinforcing member includes an inverted U-shaped member having a substantially inverted U-shaped cross section, and a U-shaped member having a substantially U-shaped cross section. The inverted U-shaped member is installed between adjacent vertical ribs such that the outer surface of the substantially inverted U-shape is in contact with the inner side surface between the adjacent vertical ribs. The mold member is straddled between the adjacent vertical ribs so that the substantially U-shaped inner surface abuts on the outer side surface of the adjacent vertical rib from below the substantially inverted U-shaped reinforcing member. It is characterized by that.
According to the steel slab structure of the present invention, the distortion in the direction perpendicular to the bridge axis of the deck plate caused by the wheel load can be suppressed by the reinforcing member of the substantially inverted U shape and the substantially U shape. it can.

第４の発明は、第１〜３のいずれかの発明において、前記補強部材は、橋軸方向に所定の間隔をおいて複数設置されることを特徴とする。   According to a fourth invention, in any one of the first to third inventions, a plurality of the reinforcing members are installed at a predetermined interval in the bridge axis direction.

第５の発明は、第３又は４の発明において、前記補強部材は、前記縦リブにボルトにて固定されることを特徴とする。
本発明による鋼床版構造によれば、迅速に補強部材を縦リブに取り付けることができ、工事を短期化できる。 According to a fifth invention, in the third or fourth invention, the reinforcing member is fixed to the vertical rib with a bolt.
According to the steel deck structure according to the present invention, the reinforcing member can be quickly attached to the vertical rib, and the construction can be shortened.

第６の発明は、第３の発明において、前記略逆Ｕ字型の補強部材を、前記デッキプレートとの間に所定の間隔を隔てて設置し、当該略逆Ｕ字型の補強部材と当該デッキプレートとの間に形成された空間に充填材を充填してなることを特徴とする。
本発明による鋼床版構造によれば、逆Ｕ字型を有する補強部材とデッキプレートとの間に形成される空間に充填材が充填されることで当該空間は変形しにくくなるため、その結果、当該空間を形成するデッキプレートの面に輪荷重がかかっても、それによって生じる歪みを抑制することができる。 According to a sixth invention, in the third invention, the substantially inverted U-shaped reinforcing member is installed at a predetermined interval from the deck plate, and the substantially inverted U-shaped reinforcing member and the The space formed between the deck plate is filled with a filler.
According to the steel slab structure of the present invention, the space is less likely to be deformed by filling the space formed between the reinforcing member having the inverted U shape and the deck plate, and as a result, Even if a wheel load is applied to the surface of the deck plate forming the space, distortion caused by the load can be suppressed.

第７の発明は、第１又は６の発明において、前記充填材として、無収縮モルタルを用いることを特徴とする。
本発明による充填材によれば、デッキプレートの下面と前記縦リブとで形成される閉断面空間内に充填後、該閉断面空間を隙間なく固化できるので、デッキプレートと縦リブとの継ぎ手内側の疲労亀裂の発生を抑制したり、橋軸方向の剛性を高めたりすることができる。 A seventh invention is characterized in that, in the first or sixth invention, non-shrink mortar is used as the filler.
According to the filler according to the present invention, the closed cross-section space can be solidified without gap after filling in the closed cross-section space formed by the lower surface of the deck plate and the vertical rib, so the inside of the joint between the deck plate and the vertical rib. It is possible to suppress the occurrence of fatigue cracks and to increase the rigidity in the bridge axis direction.

第８の発明の鋼床版の補強方法は、デッキプレートの下面に橋軸方向に延設された縦リブを複数並設してなる鋼床版を補強する鋼床版の補強方法において、前記デッキプレートの下面と前記縦リブとの間に形成される空間内に充填材を充填するとともに、隣接する縦リブ間に補強部材を設置することを特徴とする。
本発明による鋼床版の補強方法によれば、鋼床版の下側から工事可能なため、橋面上の道路を占用する必要はなく、日中に安全かつ短期間で施工することができ、工事期間も短縮できる。 The method for reinforcing a steel deck according to an eighth aspect of the present invention is the method for reinforcing a steel deck comprising reinforcing a plurality of vertical ribs extending in the bridge axis direction on the lower surface of the deck plate. The space formed between the lower surface of the deck plate and the vertical rib is filled with a filler, and a reinforcing member is installed between adjacent vertical ribs.
According to the method of reinforcing a steel slab according to the present invention, it is possible to perform construction from the bottom of the steel slab, so there is no need to occupy the road on the bridge surface, and it can be constructed safely and in a short time during the day. The construction period can be shortened.

本発明の鋼床版の補強構造及びその補強方法を用いることにより、鋼床版自体を入れ替えたり、道路を占用して施工したりすることなく、簡易な方法で、剛性及び耐久性を向上させることが可能となる。   By using the steel slab reinforcement structure and its reinforcement method of the present invention, the rigidity and durability can be improved by a simple method without replacing the steel slab itself or occupying the road. It becomes possible.

以下、本発明に係る鋼床版構造の好ましい実施形態について図面を用いて詳細に説明する。図１は、本発明に係る鋼床版の補強構造及びその補強方法の施工対象となる鋼床版の斜視図である。図１に示すように、鋼床版１０は、基盤として鋼板製のデッキプレート１２と、デッキプレート１２の下面に橋軸方向に複数延設された断面がＵ字型のＵリブ１４と、主桁１８とが組み合わされ、それぞれの部位間で溶接やボルトなどによって固定され一体化されて構成されたものであり、舗装２０は、デッキプレート１２の上側に形成される。なお、図１には示していないが、鋼床版１０には橋軸方向の所定の間隔毎に、隣接する主桁１８同士を連結する横桁が設置されており、デッキプレート１２は、橋軸直交方向は主桁１８によって、また橋軸方向は横桁によって、夫々支持される構造になっている。   Hereinafter, a preferred embodiment of a steel deck structure according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a steel slab that is a construction object of the steel slab reinforcement structure and its reinforcement method according to the present invention. As shown in FIG. 1, a steel slab 10 includes a steel plate deck plate 12 as a base, a U-shaped U-rib 14 having a plurality of U-shaped cross sections extending on the lower surface of the deck plate 12 in the bridge axis direction, The pavement 20 is formed on the upper side of the deck plate 12. The pavement 20 is formed by being combined with a girder 18 and being fixed and integrated with each other by welding or bolts. Although not shown in FIG. 1, the steel deck slab 10 is provided with cross beams connecting adjacent main girders 18 at predetermined intervals in the bridge axis direction. The axial orthogonal direction is supported by the main girder 18 and the bridge axial direction is supported by the horizontal girder.

図２は、本発明の第一の実施形態に係る補強リブを用いた鋼床版の横断面図であり、図３は、本形態に係る補強リブを用いた鋼床版の矢視図である。また図４は、図２に示す補強リブの分解図である。   FIG. 2 is a cross-sectional view of the steel deck using the reinforcing ribs according to the first embodiment of the present invention, and FIG. 3 is an arrow view of the steel deck using the reinforcing ribs according to the present embodiment. is there. 4 is an exploded view of the reinforcing rib shown in FIG.

図２及び図３に示すように、本実施形態の鋼床版１０は、舗装２０で構成される路面を走行する車両等から受ける鉛直方向の輪荷重を支持する構造を有しており、長年使用すると、特に、デッキプレート１２の面上のうちＵリブ１４が設置されていない区間Ａにおいては、それら輪荷重に対する強度が十分に得られないので、デッキプレート１２の変形が繰り返され歪みが生じやすくなる。   As shown in FIG.2 and FIG.3, the steel deck 10 of this embodiment has a structure which supports the wheel load of the vertical direction received from the vehicle etc. which drive | work the road surface comprised by the pavement 20, and has been for many years. When used, particularly in the section A where the U-rib 14 is not installed on the surface of the deck plate 12, sufficient strength against the wheel load cannot be obtained, so that the deformation of the deck plate 12 is repeated and distortion occurs. It becomes easy.

そこで、補強リブ２４をデッキプレート１２の下面に設置された隣り合うＵリブ１４の間に形成される開空間（以下、Ｕリブ間開空間という）と、橋軸に直交する方向（以下、橋軸直交方向という）の両端に位置するＵリブ１４のそれぞれの外方の側面とデッキプレート１２との間に形成される所定の開空間（以下、端位置開空間という）とに設置し、デッキプレート上の区間Ａの輪荷重をＵリブ１４の側面で支持する構造にすることで、デッキプレート１２の変形を抑制する。ここで、図４に示すように、補強リブ２４は、肉厚の鋼板を扇形に成形してなる平板状の部材であり、Ｕリブ間開空間及び端位置開空間に橋軸直交方向に設置される。そして、補強リブ２４の扇形の直線部を成す２つの縁部２４ａ、２４ｂのうち上縁２４ａがデッキプレート１２の下面に溶接され、側縁２４ｂがＵリブ１４の側面に溶接される。   Therefore, the reinforcing rib 24 is formed between an open space (hereinafter referred to as an open space between U ribs) formed between adjacent U ribs 14 installed on the lower surface of the deck plate 12, and a direction orthogonal to the bridge axis (hereinafter referred to as a bridge). The deck is installed in a predetermined open space (hereinafter referred to as an end position open space) formed between the outer side surfaces of the U ribs 14 located at both ends of the U-ribs 14 and the deck plate 12 (hereinafter referred to as end position open spaces). By adopting a structure in which the wheel load in the section A on the plate is supported by the side surface of the U-rib 14, deformation of the deck plate 12 is suppressed. Here, as shown in FIG. 4, the reinforcing rib 24 is a flat plate member formed by forming a thick steel plate into a fan shape, and is installed in the U-rib inter-space and the end position open space in the direction perpendicular to the bridge axis. Is done. The upper edge 24 a is welded to the lower surface of the deck plate 12, and the side edge 24 b is welded to the side surface of the U rib 14 among the two edges 24 a and 24 b forming the sector-shaped straight portion of the reinforcing rib 24.

また、図２及び図３に示すように、Ｕリブ間開空間では、区間Ａの領域を均等に補強するため、隣り合うＵリブ１４の対向する側面のうち、補強リブ２４が溶接される側面を千鳥状に交互に入れ替えて複数の補強リブ２４を配設する。補強リブ２４の設置間隔は、デッキプレート１２にかかる輪荷重を均等に分散支持するため、例えば、隣り合うＵリブ１４間の間隔ａと同一の長さとする。また、図４に示すように、補強リブ２４の縁部２４ａと縁部２４ｂの成す角を、例えば、デッキプレート１２の下面とＵリブ１４の側面との成す角よりも少し大きく加工する。これにより、デッキプレート１２の下面とＵリブ１４の側面との成す角に多少のばらつきが生じていても、施工の際に補強リブ２４を鉛直軸まわりに回転させることにより縁部２４ａ及び縁部２４ｂを密着させて溶接することができる。   In addition, as shown in FIGS. 2 and 3, in the open space between the U ribs, the side surface to which the reinforcing rib 24 is welded among the opposing side surfaces of the adjacent U ribs 14 in order to reinforce the area of the section A evenly. A plurality of reinforcing ribs 24 are disposed by alternately exchanging them in a zigzag pattern. The interval between the reinforcing ribs 24 is, for example, the same length as the interval a between the adjacent U ribs 14 in order to uniformly support the wheel load applied to the deck plate 12. Further, as shown in FIG. 4, the angle formed by the edge 24 a and the edge 24 b of the reinforcing rib 24 is processed to be slightly larger than, for example, the angle formed by the bottom surface of the deck plate 12 and the side surface of the U rib 14. As a result, even if there is some variation in the angle formed between the lower surface of the deck plate 12 and the side surface of the U rib 14, the edge 24a and the edge can be obtained by rotating the reinforcing rib 24 around the vertical axis during construction. 24b can be welded in close contact.

また、図２〜４に示すように、デッキプレート１２の下面とＵリブ１４とで形成される閉断面空間（以下、Ｕリブ内部空間という）に、無収縮モルタル３２を充填する。充填に際しては、Ｕリブ１４の外周面に注入穴（図示しない）及び空気穴（図示しない）を設け、当該注入穴から無収縮モルタル３２を注入しながら、空気穴から充填状況を確認する方法をとる。   As shown in FIGS. 2 to 4, a non-shrink mortar 32 is filled into a closed cross-sectional space (hereinafter referred to as U-rib internal space) formed by the lower surface of the deck plate 12 and the U-rib 14. In filling, an injection hole (not shown) and an air hole (not shown) are provided on the outer peripheral surface of the U-rib 14, and a method of checking the filling state from the air hole while injecting the non-shrink mortar 32 from the injection hole. Take.

以上説明したように、本実施形態によれば、補強リブ２４によってデッキプレート１２に掛かる載荷荷重をＵリブ１４に分散させることによりデッキプレート１２の橋軸直交方向の変形を抑制できると共に、Ｕリブ１４の内部に充填される無収縮モルタル３２によって、デッキプレート１２とＵリブ１４との継ぎ手内側の疲労亀裂の発生を抑制し、かつＵリブ１４の変形防止及び梁として構造性能を高めることができる。すなわち、デッキプレート１２は、Ｕリブ１４の側面と補強リブ２４とで囲まれた２方向性のスラブとして支持されるので、耐荷重性及び耐久性を向上させることができる。   As described above, according to the present embodiment, the load applied to the deck plate 12 by the reinforcing ribs 24 is distributed to the U ribs 14 to suppress deformation of the deck plate 12 in the direction perpendicular to the bridge axis, and the U ribs. By the non-shrink mortar 32 filled in the inside of the steel plate 14, the occurrence of fatigue cracks inside the joint between the deck plate 12 and the U rib 14 can be suppressed, the U rib 14 can be prevented from being deformed, and the structural performance can be enhanced as a beam. . That is, since the deck plate 12 is supported as a bi-directional slab surrounded by the side surfaces of the U ribs 14 and the reinforcing ribs 24, it is possible to improve load resistance and durability.

また、本実施形態によれば、補強リブ２４は、接合位置に多少の歪みが生じている際にも取り付け可能である。したがって、鋼床版１０全体を入れ替えするような大規模工事などを行う必要もないため、コスト削減及び工期短縮に寄与できる。   Further, according to the present embodiment, the reinforcing rib 24 can be attached even when some distortion occurs at the joining position. Therefore, since it is not necessary to perform a large-scale construction or the like that replaces the entire steel slab 10, it is possible to contribute to cost reduction and construction period reduction.

また、本実施形態によれば、鋼床版１０の下側から施工可能であり、舗装２０表面の道路を占用することがないため、道路封鎖にともなう車線の切り回しや通行止め、また諸作業に危険がともなう夜間工事を行う必要もない。したがって、工区や工期を細分する必要がないため工事期間を短縮できるとともに、日中の明るい時間帯に工事可能である。また、クレーンなどの大型重機を用いる必要もなく、手作業で施工可能であるのでコスト削減に寄与できる。   Moreover, according to this embodiment, since it can be constructed from the lower side of the steel floor slab 10 and does not occupy the road on the surface of the pavement 20, the lanes are turned and closed along with the road blockage. There is no need for night work that is dangerous. Therefore, it is not necessary to subdivide the work zone and work period, so that the work period can be shortened and the work can be done in the daylight hours. Moreover, it is not necessary to use a large heavy machine such as a crane, and the construction can be performed manually, which can contribute to cost reduction.

なお、本実施形態において、補強リブ２４の形状は扇形を用いたが、これに限ることなく、デッキプレート１２の下面とＵリブ１４の側面とを支持する形状であれば、三角形や台形でもよく、またこれらの補強リブ２４を２重に配置してもよい。   In the present embodiment, the shape of the reinforcing rib 24 is a fan shape, but is not limited thereto, and may be a triangle or a trapezoid as long as it supports the lower surface of the deck plate 12 and the side surface of the U rib 14. In addition, these reinforcing ribs 24 may be disposed twice.

また、本実施形態において、断面形状がＵ字型であるＵリブ１４の例を示しているが、これに限ることなく、Ｖ字型又は矩形型などのように閉断面をもつ縦リブであれば、本発明の適応が可能である。このような場合には、縦リブを支持する補強リブ２４の縁端部形状を、それら縦リブの側面に接合するように適宜成形する。   In this embodiment, an example of the U-rib 14 having a U-shaped cross-section is shown. However, the present invention is not limited to this, and a vertical rib having a closed cross-section such as a V-shape or a rectangular shape may be used. Thus, the present invention can be applied. In such a case, the edge end shape of the reinforcing rib 24 that supports the vertical ribs is appropriately formed so as to be joined to the side surfaces of the vertical ribs.

また、本実施形態において、補強リブ２４を溶接により接合するものとしているが、これに限ることなく、ボルトやネジを用いた接合方法でもよい。   In the present embodiment, the reinforcing ribs 24 are joined by welding. However, the present invention is not limited to this, and a joining method using bolts or screws may be used.

また、本実施形態において、無収縮モルタル３２をＵリブ内部空間に充填方法には、Ｕリブ１４の外周面に注入穴及び空気穴を設け、当該注入穴から無収縮モルタル３２を注入しながら空気穴から充填状況を確認するとしているが、これに限らず、舗装２０が占用可能の時にはＵリブ内部空間の上側から、すなわちデッキプレート１２及び舗装２０から、充填用の注入穴及び空気穴を設け、当該注入穴から無収縮モルタル３２を注入しながら、空気穴から充填状況を確認する方法をとってもよい。また、Ｕリブ１４の外周面に注入穴を設け、デッキプレート１２及び舗装２０に空気穴を設け、無収縮モルタル３２を注入する方法ととってもよい。   Further, in the present embodiment, in the method of filling the U-rib inner space with the non-shrink mortar 32, an injection hole and an air hole are provided on the outer peripheral surface of the U-rib 14, and air is supplied while injecting the non-shrink mortar 32 from the injection hole. The filling status is confirmed from the hole, but not limited to this, when the pavement 20 can be occupied, a filling injection hole and an air hole are provided from the upper side of the U-rib inner space, that is, from the deck plate 12 and the pavement 20. A method of checking the filling state from the air hole while injecting the non-shrink mortar 32 from the injection hole may be adopted. Alternatively, an injection hole may be provided on the outer peripheral surface of the U-rib 14, an air hole may be provided in the deck plate 12 and the pavement 20, and the non-shrink mortar 32 may be injected.

また、本実施形態において、Ｕリブ内部空間に充填する充填材として無収縮モルタル３２を用いたが、これに限らず、Ｕリブ内部空間に隙間なく充填でき、かつ、Ｕリブ内部空間の変形を抑制できる強度を有するものであればよい。   In the present embodiment, the non-shrink mortar 32 is used as a filler for filling the U-rib inner space. However, the present invention is not limited to this, and the U-rib inner space can be filled without a gap, and the U-rib inner space can be deformed. What is necessary is just to have the intensity | strength which can be suppressed.

また、本実施形態において、デッキプレート１２の下側から補強リブ２４を設置し、Ｕリブ１４内に無収縮モルタル３２を充填する順序で鋼床版を補強する施工について説明したが、これらの工程順序は適宜変更しても構わない。   Moreover, in this embodiment, although the reinforcement rib 24 was installed from the lower side of the deck plate 12, and the construction which reinforces a steel deck in the order which fills the U-shrink 14 with the non-shrink mortar 32, these processes were demonstrated. The order may be changed as appropriate.

次に、本発明の第二の実施形態について説明する。下記に示す説明において、第一実施形態と同様の構成を用いたものと対応する部分には同一の符号を付して説明を省略する。   Next, a second embodiment of the present invention will be described. In the following description, the same reference numerals are given to the portions corresponding to those using the same configuration as the first embodiment, and the description is omitted.

図５は、本発明の第二の実施形態に係る補強プレートを用いた鋼床版の横断面図であり、図６は、本形態に係る補強プレートを用いた鋼床版の矢視図である。また図７は、図５に示す補強プレートの分解図である。   FIG. 5 is a cross-sectional view of the steel deck using the reinforcing plate according to the second embodiment of the present invention, and FIG. 6 is a view as viewed from the arrow of the steel deck using the reinforcing plate according to this embodiment. is there. FIG. 7 is an exploded view of the reinforcing plate shown in FIG.

図７に示すように本実施形態では、デッキプレート１２の下側の隣接するＵリブ１４の両側面間に、板材を逆Ｕ字型に屈曲してなる逆Ｕ型補強部材２６ａを、その外側の両側面がそれぞれＵリブ１４の両側面に当接するように設置する。また、板材をＵ字型に屈曲してなる大型のＵ型補強部材２６ｂを、その内側の両側面が、隣り合う縦リブの外側の両側面にそれぞれ当接するように、補強逆Ｕ型プレート２６ａの下側に設置する。さらに、板材をＬ字型に屈曲してなるＬ型補強部材２６ｃを橋軸直交方向の端部に位置するＵリブ１４の下面と主桁１８の側面とに跨るように接合する。なお、デッキプレート１２の下面とＵリブ１４の側面との成す角に多少のばらつきが生じても、各補強プレートと鋼床版との接合面を密着させて接合できるように、補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとＬ型プレート２６ｃとの材質に、例えば、弾力性のある鋼板を用いる。ただし、図５に示すように、補強逆Ｕ型プレート２６ａをデッキプレート１２との間に所定の間隔を隔てて空間Ｂが形成するように設置する。この時、所定の厚みをもつスペーサー等（図示しない）を補強逆Ｕ型プレート２６ａとデッキプレート１２の間に設置することにより各空間Ｂの間隔を一定に確保する。   As shown in FIG. 7, in this embodiment, an inverted U-shaped reinforcing member 26 a formed by bending a plate material into an inverted U shape is provided between both side surfaces of the adjacent U rib 14 on the lower side of the deck plate 12. Are installed such that both side surfaces thereof are in contact with both side surfaces of the U-rib 14. In addition, a large U-shaped reinforcing member 26b formed by bending a plate material into a U-shape is reinforced reverse U-shaped plate 26a so that both inner side surfaces thereof are in contact with both outer side surfaces of adjacent vertical ribs. Install on the underside. Further, an L-shaped reinforcing member 26c formed by bending the plate material into an L-shape is joined so as to straddle the lower surface of the U rib 14 and the side surface of the main girder 18 positioned at the end portion in the direction orthogonal to the bridge axis. It should be noted that even if there is some variation in the angle formed between the lower surface of the deck plate 12 and the side surface of the U-rib 14, the reinforced inverted U-shape is provided so that the joint surfaces of the respective reinforcing plates and the steel deck can be joined together. As a material for the plate 26a, the large U plate 26b, and the L-shaped plate 26c, for example, an elastic steel plate is used. However, as shown in FIG. 5, the reinforced inverted U-shaped plate 26 a is installed so as to form a space B with a predetermined interval between it and the deck plate 12. At this time, spacers or the like (not shown) having a predetermined thickness are placed between the reinforced inverted U-shaped plate 26a and the deck plate 12 to ensure a constant spacing between the spaces B.

また、図６に示すように、補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとＬ型プレート２６ｃとは、区間Ａの領域を均等に補強するため、互いに補強位置が交差しないように、千鳥状に交互に入れ替えながら橋軸方向に配設される。このとき、各補強プレートの橋軸方向のプレート幅は、デッキプレート１２にかかる輪荷重を分散支持するため、Ｕリブ１４間の間隔ａと同一の幅とし、これら配置間隔も各補強プレートのプレート幅を目安として設定する。   In addition, as shown in FIG. 6, the reinforced inverted U-shaped plate 26a, the large U-plate 26b, and the L-shaped plate 26c are staggered so that the reinforcing positions do not intersect with each other in order to reinforce the region A evenly. They are arranged in the direction of the bridge axis while being alternately replaced. At this time, the plate width in the bridge axis direction of each reinforcing plate is set to the same width as the interval a between the U ribs 14 in order to support the wheel load applied to the deck plate 12 in a distributed manner. Set the width as a guide.

また、図７に示すように、補強逆Ｕ型プレート２６ａ、大型Ｕプレート２６ｂ及びＬ型プレート２６ｃをワンサイドボルト３０で固定する。   Further, as shown in FIG. 7, the reinforced inverted U-shaped plate 26 a, the large U-shaped plate 26 b and the L-shaped plate 26 c are fixed with the one-side bolt 30.

また、本実施形態の鋼床版においても、第一の実施形態と同様にＵリブ内部空間に無収縮モルタル３２を充填する。さらに、本実施形態では、デッキプレート１２と補強逆Ｕ型プレート２６ａとの間に形成された空間Ｂにも無収縮モルタル３２を充填する。この時、空間Ｂから無収縮モルタル３２が漏れ出ないように、例えば、空間Ｂのうち補強逆Ｕ型プレート２６ａの橋軸方向の縁端部に、仕切板やスポンジ等を当接することで空間Ｂを密閉し、その後、当該密閉された空間Ｂの外周面に注入穴および空気穴を設け、無収縮モルタル３２を充填するなどの充填方法をとる。   Also in the steel slab of this embodiment, the non-shrink mortar 32 is filled in the U-rib inner space as in the first embodiment. Furthermore, in this embodiment, the space B formed between the deck plate 12 and the reinforced inverted U-shaped plate 26a is also filled with the non-shrink mortar 32. At this time, in order to prevent the non-shrinkable mortar 32 from leaking out of the space B, for example, the partition B, sponge or the like is brought into contact with the edge of the reinforced inverted U-shaped plate 26a in the bridge axis direction in the space B. B is sealed, and then a filling method such as filling the non-shrink mortar 32 with an injection hole and an air hole on the outer peripheral surface of the sealed space B is performed.

以上説明したように、本実施形態によれば、補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとＬ型プレート２６ｃとによって、デッキプレート１２の橋軸直交方向の変形を抑制するだけでなく、Ｕリブ１４の内部に充填される無収縮モルタル３２によってデッキプレート１２とＵリブ１４との継ぎ手内側の疲労亀裂の発生を抑制するとともにＵリブ１４の変形防止及び梁として構造性能を高めることができる。特に、従来の鋼床版の構造で脆弱であったデッキプレート１２の区間Ａの範囲は、補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとにより２重に補強することができる。また、Ｕリブ１４の側面と補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとで囲まれたデッキプレート１２は、２方向性のスラブとして支持されるので、耐荷重性及び耐久性を向上させることができる。   As described above, according to the present embodiment, the reinforcing inverted U-shaped plate 26a, the large U-plate 26b, and the L-shaped plate 26c not only suppress deformation of the deck plate 12 in the direction perpendicular to the bridge axis, The non-shrink mortar 32 filled in the ribs 14 can suppress the occurrence of fatigue cracks inside the joint between the deck plate 12 and the U ribs 14 and can prevent the deformation of the U ribs 14 and improve the structural performance as a beam. In particular, the range of the section A of the deck plate 12 that was fragile by the structure of the conventional steel slab can be double-reinforced by the reinforced inverted U-shaped plate 26a and the large U-plate 26b. Further, since the deck plate 12 surrounded by the side surface of the U rib 14, the reinforced inverted U-shaped plate 26a, and the large U plate 26b is supported as a bi-directional slab, the load resistance and durability are improved. Can do.

また、本実施形態によれば、補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとＬ型プレート２６ｃとに、接合面を密着させて固定できる材質を用いるので、接合位置に多少の歪みが生じている際にも取り付け可能である。したがって、鋼床版１０全体を入れ替えするような大規模工事などを行う必要もないため、コスト削減及び工期短縮に寄与できる。   In addition, according to the present embodiment, the reinforcing reverse U-shaped plate 26a, the large U-plate 26b, and the L-shaped plate 26c are made of a material that can be fixed with the bonding surfaces in close contact with each other. It can be installed even when Therefore, since it is not necessary to perform a large-scale construction or the like that replaces the entire steel slab 10, it is possible to contribute to cost reduction and construction period reduction.

また、本実施形態によれば、鋼床版１０の下側から施工可能であり、舗装２０を占用することがないため、道路封鎖にともなう車線の切り回しや通行止め、また諸作業に危険がともなう夜間工事を行う必要もない。したがって、工区や工期を細分する必要がないため工事期間を短縮できるとともに、また基本的に日中の明るい時間帯に工事を行なうことが可能となる。また、特にクレーンなどの大型重機を用いる必要もなく、手作業で施工可能であるのでコスト削減に寄与できる。   Moreover, according to this embodiment, since construction is possible from the lower side of the steel slab 10 and the pavement 20 is not occupied, there is a danger in turning lanes and closing roads associated with the road blockade, and various operations. There is no need for night work. Therefore, since it is not necessary to subdivide the work zone and work period, the work period can be shortened, and the work can be basically performed in a bright daytime. In addition, it is not necessary to use a large heavy machine such as a crane, and the construction can be performed manually, which can contribute to cost reduction.

また、本実施形態によれば、デッキプレート１２と補強逆Ｕ型プレート２６ａとの間に形成された空間Ｂにも無収縮モルタル３２を充填するため、輪荷重が作用した時に歪みが生じやすいデッキプレート１２の区間Ａの変形を抑制することができる。   In addition, according to the present embodiment, the space B formed between the deck plate 12 and the reinforced inverted U-shaped plate 26a is also filled with the non-shrink mortar 32, so that the deck is likely to be distorted when a wheel load is applied. The deformation of the section A of the plate 12 can be suppressed.

また、本実施形態によれば、補強プレートをワンサイドボルト３０などのボルトで固定することができるので、迅速に施工でき工事の短期化に寄与できる。   Moreover, according to this embodiment, since a reinforcement plate can be fixed with bolts, such as the one side bolt 30, it can construct quickly and can contribute to the shortening of construction.

なお、本実施形態において、デッキプレート１２と補強逆Ｕ型プレート２６ａとの間に形成された空間Ｂと、Ｕリブ内部空間とに充填する充填材として無収縮モルタル３２を用いたが、これに限らず、これら空間に隙間なく充填でき、かつ、これら空間の変形を抑制できる強度を有するものであればよい。   In the present embodiment, the non-shrink mortar 32 is used as a filler for filling the space B formed between the deck plate 12 and the reinforcing inverted U-shaped plate 26a and the U-rib inner space. The present invention is not limited to this as long as the space can be filled without a gap and the strength of the space can be suppressed.

また、本実施形態において、デッキプレート１２の下側から補強逆Ｕ型プレート２６ａと大型Ｕプレート２６ｂとＬ型プレート２６ｃとを設置し、Ｕリブ１４内及び二重空間Ｂに無収縮モルタル３２を充填する順序で鋼床版を補強する施工を説明したが、これらの工程順序は適宜変更しても構わない。   In this embodiment, a reinforced inverted U-shaped plate 26a, a large U-plate 26b, and an L-shaped plate 26c are installed from the lower side of the deck plate 12, and the non-shrink mortar 32 is provided in the U-rib 14 and the double space B. Although the construction to reinforce the steel slab in the order of filling has been described, the order of these steps may be changed as appropriate.

また、ワンサイドボルト３０には、鋼材間を接合できるものであればこれに限らず、市販のネジを用いてもよい。   The one-side bolt 30 is not limited to this as long as it can join steel materials, and a commercially available screw may be used.

本発明に係る鋼床版の補強構造及びその補強方法の施工対象となる鋼床版の斜視図である。It is a perspective view of the steel deck which becomes the construction object of the reinforcement structure of the steel deck according to the present invention, and its reinforcement method. 本発明の第一の実施形態に係る鋼床版の横断面図である。It is a cross-sectional view of the steel deck according to the first embodiment of the present invention. 本発明の第一の実施形態に係る鋼床版の矢視図である。It is an arrow view of the steel deck according to the first embodiment of the present invention. 図２に示す補強リブの分解図である。FIG. 3 is an exploded view of a reinforcing rib shown in FIG. 2. 本発明の第二の実施形態に係る鋼床版の横断面図である。It is a cross-sectional view of the steel deck according to the second embodiment of the present invention. 本発明の第二の実施形態に係る鋼床版の矢視図である。It is an arrow view of the steel deck according to the second embodiment of the present invention. 図５に示す補強プレートの分解図である。FIG. 6 is an exploded view of the reinforcing plate shown in FIG. 5.

符号の説明Explanation of symbols

１０ 鋼床版
１２ デッキプレート
１４ Ｕリブ
２４ 補強リブ
２４ａ 補強リブの上縁
２４ｂ 補強リブの側縁
２６ａ 補強逆Ｕ型プレート
２６ｂ 大型Ｕプレート
２６ｃ Ｌ型プレート
３０ ワンサイドボルト
３２ 無収縮モルタル
Ａ デッキプレート内の下面にＵリブが設置されていない区間
Ｂ 略逆Ｕ型プレートとデッキプレートとの間に形成される空間
ａ 補強部材の設置間隔 DESCRIPTION OF SYMBOLS 10 Steel plate 12 Deck plate 14 U rib 24 Reinforcement rib 24a Upper edge of reinforcement rib 24b Side edge of reinforcement rib 26a Reinforcement reverse U type plate 26b Large U plate 26c L type plate 30 One side bolt 32 Non-shrink mortar A Deck plate Section where no U-rib is installed on the lower surface of the inside B B Space formed between the inverted U-shaped plate and deck plate a Installation interval of reinforcing members

Claims (8)

デッキプレートの下面に橋軸方向に延設された縦リブを複数並設してなる鋼床版の補強構造であって、
前記デッキプレートの下面と前記縦リブとの間に形成される空間内に充填材を充填するとともに、隣接する縦リブ間に補強部材を設置したことを特徴とする鋼床版の補強構造。 A steel floor slab reinforcement structure in which a plurality of vertical ribs extending in the bridge axis direction are arranged in parallel on the lower surface of the deck plate,
A reinforcing structure for a steel floor slab, wherein a filler is filled in a space formed between a lower surface of the deck plate and the vertical ribs, and a reinforcing member is installed between adjacent vertical ribs. 前記補強部材は、隣接する縦リブ間に橋軸と直交する方向に設置され、その縁部が前記デッキプレートの下面と少なくとも一方の縦リブの側面とに亘って接合された板状部材であることを特徴とする請求項１に記載の鋼床版の補強構造。   The reinforcing member is a plate-like member that is installed between adjacent vertical ribs in a direction perpendicular to the bridge axis, and an edge portion of the reinforcing member is bonded across the lower surface of the deck plate and the side surface of at least one vertical rib. The reinforcing structure of a steel slab according to claim 1, wherein: 前記補強部材は、断面が略逆Ｕ字型の形状を有する逆Ｕ字型部材と、断面が略Ｕ字型の形状を有するＵ字型部材とを含み、前記逆Ｕ字型部材は隣接する縦リブの間に、前記略逆Ｕ字型の外側面が当該隣接する縦リブ間の内側の側面にそれぞれ当接するように設置され、前記Ｕ字型部材は、前記略逆Ｕ字型の補強部材の下方から、前記略Ｕ字型の内側面が隣接する縦リブの外側の側面にそれぞれ当接するように当該隣接する縦リブ間に跨設されることを特徴とする請求項１に記載の鋼床版の補強構造。   The reinforcing member includes an inverted U-shaped member having a substantially inverted U-shaped cross section and a U-shaped member having a substantially U-shaped cross section, and the inverted U-shaped members are adjacent to each other. Between the vertical ribs, the outer surface of the substantially inverted U-shape is installed so as to abut on the inner side surface between the adjacent vertical ribs, and the U-shaped member is a reinforcement of the substantially inverted U-shape. The said U-shaped inner side surface is straddled between the adjacent vertical ribs so that it may contact | abut to the outer side surface of the adjacent vertical rib from the downward direction of a member, respectively. Steel slab reinforcement structure. 前記補強部材は、橋軸方向に所定の間隔をおいて複数設置されることを特徴とする請求項１〜３のいずれかに記載の鋼床版の補強構造。   The reinforcing structure of a steel slab according to any one of claims 1 to 3, wherein a plurality of the reinforcing members are installed at predetermined intervals in the bridge axis direction. 前記補強部材は、前記縦リブにボルトにて固定されることを特徴とする請求項３又は４に記載の鋼床版の補強構造。   The reinforcing structure for a steel deck according to claim 3 or 4, wherein the reinforcing member is fixed to the vertical rib with a bolt. 前記略逆Ｕ字型の補強部材を、前記デッキプレートとの間に所定の間隔を隔てて設置し、当該略逆Ｕ字型の補強部材と当該デッキプレートとの間に形成された空間に充填材を充填してなることを特徴とする請求項３に記載の鋼床版の補強構造。   The substantially inverted U-shaped reinforcing member is installed at a predetermined interval between the deck plate and a space formed between the substantially inverted U-shaped reinforcing member and the deck plate is filled. The steel slab reinforcement structure according to claim 3, which is filled with a material. 前記充填材として、無収縮モルタルを用いることを特徴とする請求項１又は６に記載の鋼床版の補強構造。   The steel floor slab reinforcement structure according to claim 1, wherein a non-shrink mortar is used as the filler. デッキプレートの下面に橋軸方向に延設された縦リブを複数並設してなる鋼床版を補強する鋼床版の補強方法において、
前記デッキプレートの下面と前記縦リブとの間に形成される空間内に充填材を充填するとともに、隣接する縦リブ間に補強部材を設置することを特徴とする鋼床版の補強方法。

In the steel plate slab reinforcement method that reinforces the steel slab formed by juxtaposing a plurality of vertical ribs extending in the bridge axis direction on the bottom surface of the deck plate,
A method for reinforcing a steel slab, comprising filling a filler in a space formed between a lower surface of the deck plate and the vertical ribs, and installing a reinforcing member between adjacent vertical ribs.

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JP4607245B1 (en) * 2010-07-23 2011-01-05 株式会社Ｉｈｉ Reinforcement structure and reinforcement method for welded part of vertical stiffener for steel deck
KR101779959B1 (en) * 2015-09-22 2017-10-23 박상현 Steel box girder maintained height and reinforced rigidity, and method for constructing thereof
US10533109B2 (en) 2014-07-01 2020-01-14 Arkema Inc. Stable aqueous fluoropolymer coating composition
JP2020122272A (en) * 2019-01-29 2020-08-13 大成建設株式会社 Steel plate deck reinforcement structure and reinforcement method
JP7162155B1 (en) 2022-04-27 2022-10-27 三井住友建設鉄構エンジニアリング株式会社 Floor slab replacement method
JP7217375B1 (en) 2022-04-26 2023-02-02 三井住友建設鉄構エンジニアリング株式会社 Floor slab replacement method

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4607245B1 (en) * 2010-07-23 2011-01-05 株式会社Ｉｈｉ Reinforcement structure and reinforcement method for welded part of vertical stiffener for steel deck
JP2012026178A (en) * 2010-07-23 2012-02-09 Ihi Corp Structure and method for reinforcing weld zone between steel floor slab and vertical stiffener
US10533109B2 (en) 2014-07-01 2020-01-14 Arkema Inc. Stable aqueous fluoropolymer coating composition
KR101779959B1 (en) * 2015-09-22 2017-10-23 박상현 Steel box girder maintained height and reinforced rigidity, and method for constructing thereof
JP2020122272A (en) * 2019-01-29 2020-08-13 大成建設株式会社 Steel plate deck reinforcement structure and reinforcement method
JP7158298B2 (en) 2019-01-29 2022-10-21 大成建設株式会社 Steel deck reinforcement structure and reinforcement method
JP7217375B1 (en) 2022-04-26 2023-02-02 三井住友建設鉄構エンジニアリング株式会社 Floor slab replacement method
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