JP7153475B2 - Floor slab renewal method and girder bridge structure - Google Patents

Floor slab renewal method and girder bridge structure Download PDF

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JP7153475B2
JP7153475B2 JP2018109758A JP2018109758A JP7153475B2 JP 7153475 B2 JP7153475 B2 JP 7153475B2 JP 2018109758 A JP2018109758 A JP 2018109758A JP 2018109758 A JP2018109758 A JP 2018109758A JP 7153475 B2 JP7153475 B2 JP 7153475B2
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JP2019210756A (en
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昭夫 春日
武 狩野
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Sumitomo Mitsui Construction Co Ltd
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Description

本発明は、桁橋の床版の更新方法及びこの更新方法によって床版が更新された桁橋に関する。 The present invention relates to a girder bridge floor slab updating method and a girder bridge whose floor slab has been updated by this updating method.

桁橋に架設されている床版は、架設後複数年が経過すると、鋼桁の腐食による板厚減少、接合部の腐食及び塩害によって鉄筋が腐食することによる構造的な性能の低下また、鉄筋の腐食によってコンクリート片が剥落して第三者被害が生じるといった問題が生じるため、その老朽化に伴って既設床版を撤去して新設床版に架け替える更新工事を行う必要がある。このような新設床版の更新を行う更新方法は、種々の方法が知られている。 Floor slabs built on girder bridges deteriorate structural performance due to corrosion of steel girders due to corrosion of steel girders, corrosion of joints, and corrosion of reinforcing bars due to salt damage after several years of construction. Since the corrosion of the concrete causes damage to third parties due to the spalling of concrete pieces, it is necessary to carry out renewal work by removing the existing floor slabs and replacing them with new ones as they age. Various methods are known for updating such new floor slabs.

例えば、主桁が横倒れ座屈を起こさないように床版を段階的に撤去し、その後、鋼桁を撤去して新桁を架設し、新規床版を構築するという手順で行われている。 For example, the floor slabs are removed in stages to prevent the main girders from collapsing and buckling, then the steel girders are removed, new girders are erected, and new floor slabs are constructed. .

また、特許文献１及び２に記載されているように、鋼桁上の床版を撤去する際には、ジベルとの接合部分を破砕した後に床版を撤去するという作業を行っている。 Further, as described in Patent Documents 1 and 2, when removing the floor slab on the steel girder, the work of removing the floor slab is performed after crushing the joint portion with the dowel.

このような床版の更新方法によれば、床版の更新工事における施工時の手間を削減し、工期の短縮化を図ることが可能となる。 According to such a floor slab renewal method, it is possible to reduce labor during execution of the floor slab renewal work and shorten the construction period.

特開２０１７－２０３２９８号公報Japanese Patent Application Laid-Open No. 2017-203298 特開２０１８－２１４０３号公報Japanese Patent Application Laid-Open No. 2018-21403

しかし、従来の床版の更新方法によると、合成桁橋の床版の更新を行う場合には、床版と鋼桁の接合部に多数のジベルが存在しているため、上フランジ幅の接合部にある床版コンクリートを人力で手バツリしたり、鋼桁の上フランジ近傍のウェブから上部を切断し、新たな上フランジを接合する作業を行うために床版の撤去に相当の時間を要していた。 However, according to the conventional deck slab renewal method, when renewing the deck slab of a composite girder bridge, there are many perforations at the joints between the deck and steel girders, so the upper flange width cannot be joined. It took a considerable amount of time to remove the floor slabs, as the floor slab concrete in the section was manually cracked, the upper part of the web near the upper flange of the steel girder was cut, and a new upper flange was joined. Was.

また、上述したように従来の更新方法によれば、主桁が横倒れ座屈を起こさないように段階的に床版を撤去しなければならないために非効率であったことに加え、床版の撤去時に主桁座屈による事故が発生する可能性があるために安全性に問題があった。 Moreover, as described above, according to the conventional renewal method, the floor slabs must be removed in stages so that the main girders do not fall over and buckle, which is inefficient. There was a safety problem due to the possibility of an accident due to buckling of the main girder during the removal of the main girder.

さらに、新橋の架設時も床版を新桁に構築するときは桁の応力状態を把握したうえで、決まった順番で床版を構築していかなければならず、作業効率が悪いという問題があった。 Furthermore, when constructing the floor slabs on new girders during the erection of a new bridge, it is necessary to grasp the stress state of the girders and then construct the floor slabs in a fixed order, resulting in poor work efficiency. there were.

そこで、本発明は上記問題に鑑みてなされたものであり、旧橋の床版解体を実施することなく、大幅な工期短縮が可能となると共に、桁の横倒れ座屈防止による品質確保と安全性確保を図ることができる床版の更新方法及び桁橋構造を提供することを目的とする。 Therefore, the present invention has been made in view of the above problems, and it is possible to significantly shorten the construction period without dismantling the floor slabs of the old bridge, and to ensure quality and safety by preventing sideways buckling of the girder. It is an object of the present invention to provide a floor slab renewal method and a girder bridge structure capable of ensuring safety.

本発明に係る床版の更新方法は、桁と床版とを有する桁橋における該床版の更新方法であって、前記床版の前記桁との接合部分を含み前記桁間に延設する連結部を有する床版桁上部を除く部分である前記床版に形成された壁高欄および舗装面であるアスファルト部並びに張出し床版を除去する工程と、前記床版桁上部に凹部を形成する工程と、前記凹部に挿入される係合部を有すると共に、橋軸直角方向に延びる張り出し床版を有するコンクリート製の新規床版を準備する工程と、前記係合部に前記凹部を挿入するとともに、前記桁に前記新規床版を備え付ける工程と、前記凹部に接合材を注入する工程との何れか一方の工程を行った後、何れか他方の工程を行い、前記接合材を固化させて前記床版桁上部と前記新規床版を固定する工程とを備えることを特徴とする。 A method for renewing a floor slab according to the present invention is a method for renewing a floor slab in a girder bridge having girders and floor slabs, wherein the floor slabs extend between the girders, including joints between the floor slabs and the girders. A step of removing the wall balustrade formed on the floor slab, the asphalt portion that is the pavement surface, and the overhanging floor slab, excluding the upper part of the floor slab girder having the connection part to be provided , and forming a recess in the upper part of the floor slab girder. a step of preparing a new floor slab made of concrete having an engaging portion to be inserted into the recess and having an overhang floor slab extending in a direction perpendicular to the bridge axis; and inserting the recess into the engaging portion. At the same time, after performing one of the step of installing the new floor slab on the girder and the step of injecting the bonding material into the recess, the other step is performed to solidify the bonding material. A step of fixing the floor slab girder upper part and the new floor slab is provided.

また、本発明に係る床版の更新方法において、前記凹部は、複数の孔として形成され、前記凹部に接合材を注入する工程を行った後に、前記係合部に前記凹部を挿入するとともに、前記桁に前記新規床版を備え付ける工程を行うと好適である。 Further, in the floor slab renewal method according to the present invention, the recess is formed as a plurality of holes, and after a step of injecting a bonding material into the recess, the recess is inserted into the engaging portion, It is preferable to perform a step of attaching the new floor slab to the girder.

また、本発明に係る床版の更新方法において、前記凹部は、前記桁橋の橋軸方向に延設される溝形状に形成され、前記係合部に前記凹部を挿入するとともに、前記桁に前記新規床版を備え付ける工程を行った後に、前記凹部に接合材を注入する工程を行うと好適である。 Further, in the floor slab renewal method according to the present invention, the recess is formed in a groove shape extending in the bridge axis direction of the girder bridge, and the recess is inserted into the engagement portion, and the girder It is preferable to perform the step of injecting a bonding material into the recess after performing the step of installing the new floor slab.

また、本発明に係る床版の更新方法において、前記係合部は、定着部を有する鉄筋であると好適である。 Moreover, in the floor slab renewal method according to the present invention, it is preferable that the engaging portion is a reinforcing bar having a fixing portion.

また、本発明に係る床版の更新方法において、外ケーブルを施工する工程を有すると好適である。 Moreover, it is preferable that the floor slab renewal method according to the present invention includes a step of installing an external cable.

また、本発明に係る桁橋構造は、桁と、該桁に固定され、凹部を有すると共に前記桁間に延設する連結部を有する床版桁上部と、前記床版桁上部に固定されたコンクリート製の新規床版を備え、前記新規床版は、前記凹部に挿入される係合部を有すると共に、橋軸直角方向に延びる張り出し床版を有することを特徴とする。
In addition, the girder bridge structure according to the present invention includes girders, upper floor slab girders having recesses fixed to the girders and connecting portions extending between the girders, and A new floor slab made of concrete is provided, and the new floor slab has an engaging portion to be inserted into the recess and has an overhang floor slab extending in a direction perpendicular to the bridge axis.

上記発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションもまた発明となり得る。 The above summary of the invention is not an exhaustive list of all the necessary features of the invention, and subcombinations of these features can also be inventions.

本発明に係る床版の更新方法によれば、床版の解体を行わずに既設床版の床版桁上部を残し、該床版桁上部に新規床版を固定するので、大幅な工期短縮を図ることができると共に、桁の横倒れ座屈防止による品質及び安全性の確保を図ることができる。 According to the method for renewing a floor slab according to the present invention, the upper part of the floor slab girders of the existing floor slab is left without dismantling the floor slab, and the new floor slab is fixed to the upper part of the floor slab girders, thereby significantly shortening the construction period. In addition, it is possible to ensure quality and safety by preventing sideways buckling of the girder.

第１の実施形態に係る床版の更新方法を適用する既設桁橋の概要を説明するための図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an overview of an existing girder bridge to which the floor slab updating method according to the first embodiment is applied; 第１の実施形態に係る床版の更新方法を説明するための図。FIG. 4 is a diagram for explaining a floor slab updating method according to the first embodiment; 図２の側面図。FIG. 3 is a side view of FIG. 2; 第１の実施形態に係る床版の更新方法における新規床版を備え付ける工程を説明するための図。FIG. 4 is a diagram for explaining a step of installing a new floor slab in the floor slab updating method according to the first embodiment; 図４の側面図。FIG. 5 is a side view of FIG. 4; 第１の実施形態に係る床版の更新方法に用いられる新規床版の拡大図。FIG. 4 is an enlarged view of a new floor slab used in the floor slab updating method according to the first embodiment; 第１の実施形態に係る床版の更新方法における間詰め部を説明するための図。FIG. 5 is a diagram for explaining the spacing part in the floor slab updating method according to the first embodiment; 第１の実施形態に係る床版の更新方法を行った桁橋を説明するための図。FIG. 4 is a diagram for explaining a girder bridge subjected to the floor slab updating method according to the first embodiment; 第２の実施形態に係る床版の更新方法を説明するための図。FIG. 8 is a diagram for explaining a floor slab updating method according to the second embodiment; 第２実施形態に係る床版の更新方法を説明するための図であって、床版桁上部に形成した凹部の構成を説明するための図。FIG. 11 is a diagram for explaining the method for updating the floor slab according to the second embodiment, and is a diagram for explaining the configuration of the recess formed in the upper part of the floor slab girder. 第２の実施形態に係る床版の更新方法を説明するための図であって、新規床版を備え付けた状態を説明するための図。FIG. 11 is a diagram for explaining a floor slab updating method according to the second embodiment, and is a diagram for explaining a state in which a new floor slab is installed; 第２の実施形態に係る床版の更新方法を説明するための図であって、接合材を打設した状態を説明するための図。FIG. 10 is a diagram for explaining a floor slab updating method according to the second embodiment, and is a diagram for explaining a state in which a jointing material has been cast; 第２の実施形態に係る床版の更新方法を行った桁橋を説明するための図。FIG. 11 is a diagram for explaining a girder bridge on which the floor slab updating method according to the second embodiment is performed;

以下、本発明を実施するための好適な実施形態について、図面を用いて説明する。なお、以下の実施形態は、各請求項に係る発明を限定するものではなく、また、実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。 Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. In addition, the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the solution of the invention. .

［第１の実施形態］
図１は、第１の実施形態に係る床版の更新方法を適用する既設桁橋の概要を説明するための図であり、図２は、第１の実施形態に係る床版の更新方法を説明するための図であり、図３は、図２の側面図であり、図４は、第１の実施形態に係る床版の更新方法における新規床版を備え付ける工程を説明するための図であり、図５は、図４の側面図であり、図６は、第１の実施形態に係る床版の更新方法に用いられる新規床版の拡大図であり、図７は、第１の実施形態に係る床版の更新方法における間詰め部を説明するための図であり、図８は、第１の実施形態に係る床版の更新方法を行った桁橋を説明するための図である。 [First Embodiment]
FIG. 1 is a diagram for explaining an outline of an existing girder bridge to which the floor slab renewal method according to the first embodiment is applied, and FIG. 2 shows the floor slab renewal method according to the first embodiment. 3 is a side view of FIG. 2, and FIG. 4 is a diagram for explaining a step of installing a new floor slab in the floor slab updating method according to the first embodiment. 5 is a side view of FIG. 4, FIG. 6 is an enlarged view of a new floor slab used in the floor slab updating method according to the first embodiment, and FIG. FIG. 8 is a diagram for explaining the spacing part in the floor slab updating method according to the embodiment, and FIG. 8 is a diagram for explaining a girder bridge on which the floor slab updating method according to the first embodiment is performed. .

まず、本実施形態に係る床版の更新方法を適用する桁橋１について説明を行う。図１に示すように、本実施形態に係る床版の更新方法を適用する桁橋１は、桁１０と該桁１０上に載置されて固定された床版２０とを有している。桁１０は、所定寸法の厚板鋼板同士を溶接又は継手などによって組立てたＩ形断面鋼板であって、床版２０の床版桁上部２１を載置する上フランジ部と、下フランジ部とを備えている。 First, the girder bridge 1 to which the floor slab updating method according to the present embodiment is applied will be described. As shown in FIG. 1, a girder bridge 1 to which the floor slab renewal method according to the present embodiment is applied has a girder 10 and a floor slab 20 placed and fixed on the girder 10 . The girder 10 is an I-shaped cross-section steel plate assembled by welding or jointing thick steel plates of a predetermined size, and has an upper flange portion on which the floor slab girder upper portion 21 of the floor slab 20 is placed and a lower flange portion. I have.

また、床版２０は、場所打ちコンクリート部材からなり、上述した桁１０の上フランジ部と接合される床版桁上部２１と、床版桁上部２１から水平方向に延設された張出し床版２４とを有している。なお、床版２０は、プレストレストコンクリートであってもよく、鉄筋コンクリートであっても構わない。さらに、床版２０の上面には舗装面となるアスファルト部２５が形成され、幅方向の両端には張出し床版２４から立設する壁高欄２３が形成されている。 The floor slab 20 is made of cast-in-place concrete members, and includes an upper floor slab girder 21 joined to the upper flange portion of the girder 10 described above, and an overhanging floor slab 24 horizontally extending from the upper floor slab girder 21. and The floor slab 20 may be made of prestressed concrete or reinforced concrete. Furthermore, an asphalt portion 25 serving as a paved surface is formed on the upper surface of the floor slab 20, and wall balustrades 23 erected from the overhanging floor slabs 24 are formed at both ends in the width direction.

次に、図２から８を参照して本実施形態に係る床版の更新方法について説明を行う。まず、図２に示すように、床版桁上部２１を除く部分、すなわち、床版２０に形成された壁高欄２３及び舗装面であるアスファルト部２５並びに張出し床版２４を撤去する。このとき、既設の床版２０の撤去を行わず、壁高欄２３及びアスファルト部２５並びに張出し床版２４の撤去の後も桁１０上に床版桁上部２１が残っている。 Next, a floor slab updating method according to the present embodiment will be described with reference to FIGS. First, as shown in FIG. 2, the portion excluding the floor slab girder upper portion 21, that is, the wall balustrade 23 formed on the floor slab 20, the asphalt portion 25 which is the pavement surface, and the overhang slab 24 are removed. At this time, the existing floor slab 20 is not removed, and the floor slab girder upper part 21 remains on the girder 10 even after the wall balustrade 23, the asphalt part 25 and the overhanging floor slab 24 are removed.

次に、床版桁上部２１に凹部２２としての孔を形成する。凹部２２は、後述する新規床版３０の係合部３１が挿入可能なように係合部３１の径よりも若干大きめに形成されている。また、図３に示すように、凹部２２は桁１０の橋軸方向に沿って複数形成されている。 Next, holes are formed as recesses 22 in the floor slab upper part 21 . The concave portion 22 is formed slightly larger in diameter than the engaging portion 31 so that the engaging portion 31 of the new floor slab 30, which will be described later, can be inserted. Further, as shown in FIG. 3 , a plurality of recesses 22 are formed along the bridge axis direction of the girder 10 .

その後、図４に示すように、凹部２２に無収縮モルタルなどの接合材４０を注入する。このとき、接合材４０は、凹部２２を覆うように床版桁上部２１の平面部に敷設しても構わない。また、接合材４０は、始めに凹部２２に注入し、該凹部２２に定着部を有する鉄筋の係合部３１を挿入し、新規床版３０と既設の床版２０の間の隙間に無収縮モルタルなどの接合材４０を注入しても構わない。 Thereafter, as shown in FIG. 4, a bonding material 40 such as non-shrinkage mortar is injected into the recess 22 . At this time, the joint material 40 may be laid on the flat portion of the floor slab upper portion 21 so as to cover the recess 22 . In addition, the joint material 40 is first injected into the recess 22 , and the reinforcing bar engaging portion 31 having the fixing portion is inserted into the recess 22 , and the gap between the new floor slab 30 and the existing floor slab 20 is filled with no shrinkage. A bonding material 40 such as mortar may be injected.

凹部２２に接合材４０を注入した後、凹部２２に挿入される係合部３１を有する新規床版３０を準備し、凹部２２に係合部３１を挿入するように、桁１０に新規床版３０を備え付ける。図５に示すように、新規床版３０は、橋軸方向に所定の長さに分割されて形成されているので、凹部２２の形成方向に沿うように橋軸方向に複数備え付けられる。 After injecting the joint material 40 into the recess 22, a new floor slab 30 having an engaging portion 31 to be inserted into the recess 22 is prepared, and the new floor slab 30 is attached to the girder 10 so that the engaging portion 31 is inserted into the recess 22. 30 provided. As shown in FIG. 5 , the new floor slab 30 is formed by being divided into predetermined lengths in the direction of the bridge axis, so that a plurality of new floor slabs 30 are provided along the direction of formation of the recesses 22 .

図６に示すように、新規床版３０は、下面から垂下する係合部３１が形成されており、該係合部３１は、先端に定着部を有する鉄筋であると好適であり、該定着部によって接合材４０が固化した際に新規床版３０の接合の確実性を高めることができる。 As shown in FIG. 6, the new floor slab 30 is formed with an engaging portion 31 that hangs down from the bottom surface. When the joint material 40 is solidified by the joint, the certainty of joining the new floor slab 30 can be enhanced.

新規床版３０を橋軸方向に沿って備え付ける際、図７に示すように、隣り合う新規床版３０の間に所定の間隔を設けて備え付け、該間隔に無収縮モルタルを打設して間詰め部４１を形成する。また、新規床版３０の橋軸方向は、ループ鉄筋又は定着部を有する鉄筋で接合する。 When installing the new floor slabs 30 along the bridge axis direction, as shown in FIG. A filling portion 41 is formed. In addition, the new floor slab 30 is joined in the direction of the bridge axis by a loop reinforcing bar or a reinforcing bar having a fixed portion.

その後、図８に示すように、新規床版３０に新規壁高欄３２及び舗装面となる新規アスファルト部３３を施工する。また、新規床版３０の重量だけ床版の死荷重が増加しているので、外ケーブル５０を用いて桁１０にプレストレスを導入して補強する。なお、既設の床版２０の下面の損傷が大きい場合には、剥落防止対策を施しても構わない。 After that, as shown in FIG. 8, a new wall balustrade 32 and a new asphalt portion 33 that will be the pavement surface are constructed on the new floor slab 30 . Also, since the dead load of the floor slab is increased by the weight of the new floor slab 30, prestress is introduced into the girder 10 using the outer cable 50 to reinforce it. In addition, when the damage of the lower surface of the existing floor slab 20 is large, measures to prevent peeling may be taken.

このように本実施形態に係る床版の更新方法によれば、既設の床版２０を有する旧橋の床版解体を実施することなく床版の更新を行うことができるので、大幅な工期短縮を図ることができ、桁の横倒れ座屈防止による品質確保と安全確保を図ることができる。 As described above, according to the floor slab renewal method according to the present embodiment, the floor slabs can be renewed without dismantling the floor slabs of the old bridge having the existing floor slabs 20, thereby significantly shortening the construction period. It is possible to ensure quality and safety by preventing sideways buckling of the girder.

［第２の実施形態］
以上説明した第１の実施形態に係る床版の更新方法では、凹部として孔を形成した場合について説明した。次に説明する第２の実施形態に係る床版の更新方法は、第１の実施形態とは異なる形態を有する凹部の実施例について説明を行うものである。なお、上述した第１の実施形態の場合と同一又は類似する部材については、同一符号を付して説明を省略する。 [Second embodiment]
In the floor slab renewal method according to the first embodiment described above, a case where holes are formed as recesses has been described. The floor slab updating method according to the second embodiment, which will be described next, describes an example of a recess having a shape different from that of the first embodiment. The same or similar members as those in the above-described first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

図１０は、第２実施形態に係る床版の更新方法を説明するための図であって、床版桁上部に形成した凹部の構成を説明するための図であり、図１１は、第２の実施形態に係る床版の更新方法を説明するための図であって、新規床版を備え付けた状態を説明するための図であり、図１２は、第２の実施形態に係る床版の更新方法を説明するための図であって、接合材を打設した状態を説明するための図であり、図１３は、第２の実施形態に係る床版の更新方法を行った桁橋を説明するための図である。 FIG. 10 is a diagram for explaining a floor slab renewal method according to the second embodiment, and is a diagram for explaining the configuration of a recess formed in the upper part of the floor slab girder. FIG. 12 is a diagram for explaining the floor slab updating method according to the second embodiment, and is a diagram for explaining a state in which a new floor slab is installed; FIG. FIG. 13 is a diagram for explaining the renewal method, and is a diagram for explaining a state in which the joint material is placed. FIG. 13 shows a girder bridge subjected to the floor slab renewal method according to the second embodiment. It is a figure for explaining.

図９に示すように、床版桁上部２１を除く部分、すなわち、床版２０に形成された壁高欄２３及び舗装面であるアスファルト部２５並びに張出し床版２４を撤去する。このとき、既設の床版２０の撤去を行わず、壁高欄２３及びアスファルト部２５並びに張出し床版２４の撤去の後も桁１０上に床版桁上部２１が残っている。 As shown in FIG. 9, the parts other than the floor slab upper part 21, that is, the wall balustrade 23 formed on the floor slab 20, the asphalt part 25 which is the pavement surface, and the overhanging floor slab 24 are removed. At this time, the existing floor slab 20 is not removed, and the floor slab girder upper part 21 remains on the girder 10 even after the wall balustrade 23, the asphalt part 25 and the overhanging floor slab 24 are removed.

次に、床版桁上部２１に凹部２２ａとしての溝を形成する。凹部２２ａは、第１の実施形態と同様に新規床版３０の係合部３１が挿入可能なように係合部３１の径よりも若干幅方向に沿った寸法が大きめに形成されている。また、図１０に示すように、凹部２２ａは桁１０の橋軸方向に沿って形成されている。 Next, grooves are formed in the floor slab upper part 21 as recesses 22a. As in the first embodiment, the recess 22a is formed to have a dimension slightly larger than the diameter of the engaging portion 31 along the width direction so that the engaging portion 31 of the new floor slab 30 can be inserted. Further, as shown in FIG. 10, the recess 22a is formed along the bridge axis direction of the girder 10. As shown in FIG.

その後、図１１に示すように、凹部２２ａに挿入される係合部３１を有する新規床版３０を準備し、凹部２２ａに係合部３１を挿入するように、桁１０に新規床版３０を備え付ける。図１１に示すように、新規床版３０は、橋軸方向に所定の長さに分割されて形成されているので、凹部２２ａの延設方向に沿うように橋軸方向に複数備え付けられる。また、隣り合う新規床版３０は、間詰め部４１に無収縮モルタルを打設し、その後橋軸方向に沿ってＰＣ鋼材５１によって接合されている。 After that, as shown in FIG. 11, a new floor slab 30 having an engaging portion 31 to be inserted into the recess 22a is prepared, and the new floor slab 30 is attached to the girder 10 so that the engaging portion 31 is inserted into the recess 22a. equip. As shown in FIG. 11, the new floor slabs 30 are formed by being divided into predetermined lengths in the bridge axis direction, so that a plurality of new floor slabs 30 are provided in the bridge axis direction along the extending direction of the recesses 22a. In addition, the adjacent new floor slabs 30 are joined with PC steel material 51 along the bridge axis direction after non-shrinkage mortar is placed in the interstitial space 41 .

その後、図１２に示すように、凹部２２ａに無収縮モルタルなどの接合材４０を注入して新規床版３０と既設の床版２０とを一体化させる。 Thereafter, as shown in FIG. 12, a bonding material 40 such as non-shrinking mortar is injected into the recess 22a to integrate the new floor slab 30 and the existing floor slab 20 together.

凹部２２ａに接合材４０を注入して接合材４０が固化した後、図１３に示すように、新規床版３０に新規壁高欄３２及び舗装面となる新規アスファルト部３３を施工すると共に、既設の床版２０の床版桁上部２１間の部分を撤去する。また、新規床版３０の重量だけ床版の死荷重が増加しているので、外ケーブル５０を用いて桁１０にプレストレスを導入して補強する。なお、既設の床版２０の下面の損傷が大きい場合には、剥落防止対策を施しても構わない。 After the bonding material 40 is injected into the recess 22a and the bonding material 40 is solidified, as shown in FIG. A portion between floor slab girder upper parts 21 of the floor slab 20 is removed. Also, since the dead load of the floor slab is increased by the weight of the new floor slab 30, prestress is introduced into the girder 10 using the outer cable 50 to reinforce it. In addition, when the damage of the lower surface of the existing floor slab 20 is large, measures to prevent peeling may be taken.

このように本実施形態に係る床版の更新方法によれば、既設の床版２０を有する旧橋の床版解体を実施することなく床版の更新を行うことができるので、大幅な工期短縮を図ることができ、桁の横倒れ座屈防止による品質確保と安全確保を図ることができる。 As described above, according to the floor slab renewal method according to the present embodiment, the floor slabs can be renewed without dismantling the floor slabs of the old bridge having the existing floor slabs 20, thereby significantly shortening the construction period. It is possible to ensure quality and safety by preventing sideways buckling of the girder.

また、上述した第１の実施形態及び第２の実施形態に係る床版の更新方法が適用された桁橋構造は、既設の床版の床版桁上部の上に新規床版を備えているので、道路面の高さが高くなるため、端部において舗装などで擦り付けを行うと好適である。また、既設の床版の撤去は工事終了後の供用後に既設の床版の下面から行っても構わない。 In addition, the girder bridge structure to which the floor slab renewal method according to the first and second embodiments described above is applied has a new floor slab on top of the floor slab girder of the existing floor slab. Therefore, since the height of the road surface is increased, it is preferable to rub the ends with pavement or the like. In addition, the existing floor slabs may be removed from the lower surface of the existing floor slabs after the completion of the construction work and after they are put into service.

以上説明したように、上述した本実施形態に係る床版の更新方法では、鋼桁に適用した場合について説明を行ったが、本実施形態に係る床版の更新方法が適用される桁橋はこれに限らず、例えば、桁橋１は、主桁設計において、桁１０と床版２０とを頭付きスタッドなどを用いたずれ止めを形成して床版２０にも主桁作用を見込んだ合成桁橋に適用しても構わないし、床版２０と桁１０をずれ防止のために棒鋼を用いたスラブアンカーで連結しているが、床版２０には主桁作用を見込まない非合成桁橋に適用しても構わない。その様な変更又は改良を加えた形態も本発明の技術的範囲に含まれうることが、特許請求の範囲の記載から明らかである。 As described above, the floor slab renewal method according to the present embodiment described above is applied to steel girders. Not limited to this, for example, in the girder bridge 1, in the main girder design, the girder 10 and the floor slab 20 are combined to prevent slipping using headed studs or the like, and the floor slab 20 is synthesized in anticipation of the main girder action. It may be applied to a girder bridge, and the floor slab 20 and the girder 10 are connected by slab anchors using steel bars to prevent slippage, but the floor slab 20 is a non-synthetic girder bridge that is not expected to act as a main girder. may be applied to It is clear from the description of the scope of claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

１ 桁橋， １０ 桁, ２０ 床版， ２１ 床版桁上部， ２２，２２ａ 凹部， ２３ 壁高欄， ２４ 張出し床版， ２５ アスファルト部， ３０ 新規床版， ３１ 係合部， ３２ 新規壁高欄， ３３ 新規アスファルト部， ４０ 接合材， ４１ 間詰め部， ５０ 外ケーブル， ５１ ＰＣ鋼材。 1 girder bridge, 10 girder, 20 floor slab, 21 floor slab upper part, 22, 22a recess, 23 wall balustrade, 24 overhang slab, 25 asphalt part, 30 new floor slab, 31 engaging part, 32 new wall balustrade, 33 new asphalt section, 40 joining material, 41 filling section, 50 outer cable, 51 PC steel material.

Claims (6)

桁と床版とを有する桁橋における該床版の更新方法であって、
前記床版の前記桁との接合部分を含み前記桁間に延設する連結部を有する床版桁上部を除く部分である前記床版に形成された壁高欄および舗装面であるアスファルト部並びに張出し床版を除去する工程と、
前記床版桁上部に凹部を形成する工程と、
前記凹部に挿入される係合部を有すると共に、橋軸直角方向に延びる張り出し床版を有するコンクリート製の新規床版を準備する工程と、
前記係合部に前記凹部を挿入するとともに、前記桁に前記新規床版を備え付ける工程と、前記凹部に接合材を注入する工程との何れか一方の工程を行った後、何れか他方の工程を行い、
前記接合材を固化させて前記床版桁上部と前記新規床版を固定する工程とを備えることを特徴とする床版の更新方法。 A method for updating a floor slab in a girder bridge having a girder and a floor slab, comprising:
A wall balustrade formed on the floor slab, which is a portion excluding the upper part of the floor slab having a connecting portion extending between the girders, including the joint portion with the girders of the floor slab, and an asphalt portion that is a paved surface and a step of removing the overhanging floor slab ;
forming a recess in the upper part of the floor slab;
a step of preparing a new concrete floor slab having an engaging portion to be inserted into the recess and having an overhang floor slab extending in a direction perpendicular to the bridge axis;
After performing one of the step of inserting the recess into the engaging portion and mounting the new floor slab on the girder and the step of injecting a bonding material into the recess, the other step and
A method for renewing a floor slab, comprising the step of fixing the upper part of the floor slab and the new floor slab by solidifying the joint material. 請求項１に記載の床版の更新方法において、
前記凹部は、複数の孔として形成され、
前記凹部に接合材を注入する工程を行った後に、前記係合部に前記凹部を挿入するとともに、前記桁に前記新規床版を備え付ける工程を行うことを特徴とする床版の更新方法。 In the floor slab update method according to claim 1,
The recess is formed as a plurality of holes,
A method for renewing a floor slab, characterized by performing a step of inserting the recess into the engaging portion and mounting the new floor slab on the girder after performing a step of injecting a bonding material into the recess. 請求項１に記載の床版の更新方法において、
前記凹部は、前記桁橋の橋軸方向に延設される溝形状に形成され、
前記係合部に前記凹部を挿入するとともに、前記桁に前記新規床版を備え付ける工程を行った後に、前記凹部に接合材を注入する工程を行うことを特徴とする床版の更新方法。 In the floor slab update method according to claim 1,
The recess is formed in a groove shape extending in the bridge axis direction of the girder bridge,
A method for renewing a floor slab, characterized by performing a step of inserting the recess into the engaging portion and mounting the new floor slab on the girder, and then performing a step of injecting a joint material into the recess. 請求項１から３の何れか１項に記載の床版の更新方法において、
前記係合部は、定着部を有する鉄筋であることを特徴とする床版の更新方法。 In the floor slab updating method according to any one of claims 1 to 3,
A method for renewing a floor slab, wherein the engaging portion is a reinforcing bar having a fixing portion. 請求項１から４の何れか１項に記載の床版の更新方法において、
外ケーブルを施工する工程を有することを特徴とする床版の更新方法。 In the floor slab updating method according to any one of claims 1 to 4,
A method for renewing a floor slab, comprising a step of installing an outer cable. 桁と、
該桁に固定され、凹部を有すると共に前記桁間に延設する連結部を有する床版桁上部と、
前記床版桁上部に固定されたコンクリート製の新規床版を備え、
前記新規床版は、前記凹部に挿入される係合部を有すると共に、橋軸直角方向に延びる張り出し床版を有することを特徴とする桁橋構造。 digits and
an upper floor slab girder fixed to the girder, having a concave portion and a connecting portion extending between the girder;
Equipped with a new concrete floor slab fixed to the upper part of the floor slab girder,
A girder bridge structure, wherein the new floor slab has an engaging portion to be inserted into the recess and has an overhanging floor slab extending in a direction perpendicular to the bridge axis.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001081726A (en) 1999-09-16 2001-03-27 Ishikawajima Harima Heavy Ind Co Ltd Method and structure for re-laying steel floor slab of concrete floor slab bridge
JP2003293323A (en) 2002-03-29 2003-10-15 Topy Ind Ltd Reinforcement structure of continuous girder bridge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001081726A (en) 1999-09-16 2001-03-27 Ishikawajima Harima Heavy Ind Co Ltd Method and structure for re-laying steel floor slab of concrete floor slab bridge
JP2003293323A (en) 2002-03-29 2003-10-15 Topy Ind Ltd Reinforcement structure of continuous girder bridge

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