JP6778159B2 - Reinforcing structure and floor slab replacement method when replacing the floor slab - Google Patents

Reinforcing structure and floor slab replacement method when replacing the floor slab Download PDF

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JP6778159B2
JP6778159B2 JP2017147988A JP2017147988A JP6778159B2 JP 6778159 B2 JP6778159 B2 JP 6778159B2 JP 2017147988 A JP2017147988 A JP 2017147988A JP 2017147988 A JP2017147988 A JP 2017147988A JP 6778159 B2 JP6778159 B2 JP 6778159B2
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floor slab
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浩郎 南
浩郎 南
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Kajima Corp
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Description

本発明は、床版入替時の補強構造及び床版入替方法に関する。 The present invention relates to a reinforcing structure at the time of replacing the floor slab and a method for replacing the floor slab.

橋桁の上に架設された既設床版の経年劣化に応じて、既設床版は新設床版に入れ替えられている。床版入替時において、橋桁の上に架設された既設床版の全部を撤去し、新設床版に入れ替えることは長い時間を要し、通行止めのために交通量が低下する期間が長くなる。そのため、夜間の交通量が少なくなる時間帯において、特許文献１に記載されているように、橋桁の上に架設された既設床版の一部をその長手方向に１．５〜２ｍごとに全幅にわたって切断することにより撤去し、橋桁の上に残存する既設床版に隣接して新たに新設床版を設置して、短い区間ずつ床版の入れ替えを行う技術が提案されている。特許文献１に記載されているような技術においては、日中の交通量が多くなる時間帯においては、新設床版が設置された区間や、新設床版に隣接する既設床版の区間に車両を通行させることにより、交通量への低下を抑制することが考えられる。 The existing floor slab has been replaced with a new floor slab as the existing floor slab erected on the bridge girder deteriorates over time. When replacing the floor slab, it takes a long time to remove all the existing floor slabs erected on the bridge girder and replace them with new floor slabs, and the period during which the traffic volume decreases due to traffic closure becomes long. Therefore, as described in Patent Document 1, a part of the existing floor slab erected on the bridge girder has a total width of 1.5 to 2 m in the longitudinal direction during the time when the traffic volume at night is low. A technique has been proposed in which the floor slab is removed by cutting over the bridge girder, a new floor slab is newly installed adjacent to the existing floor slab remaining on the bridge girder, and the floor slab is replaced in short sections. In the technology described in Patent Document 1, the vehicle is installed in the section where the new floor slab is installed or in the section of the existing floor slab adjacent to the new floor slab during the time when the traffic volume during the daytime is heavy. It is conceivable to suppress the decrease in traffic volume by passing through.

特許第２５７８３０５号公報Japanese Patent No. 2578305

ところで、新たに設置された新設床版に隣接する既設床版は、経年劣化に加えて、その一部を撤去され、新設床版との継目が出来たことにより強度が低下する。そのため、車両が既設床版と新設床版との継目を通行する際などにおいて既設床版の下方への荷重に対する耐久力が低い欠点がある。 By the way, the strength of the existing floor slab adjacent to the newly installed new floor slab is reduced due to deterioration over time, a part of the existing floor slab being removed, and a seam with the new floor slab. Therefore, there is a drawback that the durability against the downward load of the existing floor slab is low when the vehicle passes through the joint between the existing floor slab and the new floor slab.

そこで本発明は、既設床版の下方への荷重に対する耐久力を向上させることができる床版入替時の補強構造及び床版入替方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a reinforcing structure at the time of replacing the floor slab and a method for replacing the floor slab, which can improve the durability of the existing floor slab against a downward load.

本発明は、橋桁の上に架設された既設床版の一部を撤去し、橋桁の上に残存する既設床版に隣接して新たに新設床版を設置する床版入替時の補強構造であって、橋桁の上に残存する既設床版に隣接して新たに設置された新設床版から既設床版の下面へと延在し、既設床版の下面とは分離しつつ、既設床版の下面を支持することにより、既設床版に対する下方への荷重を新設床版に支持させるブラケットを備えた床版入替時の補強構造である。 The present invention is a reinforcing structure at the time of replacing a floor slab in which a part of the existing floor slab erected on the bridge girder is removed and a new floor slab is newly installed adjacent to the existing floor slab remaining on the bridge girder. Therefore, it extends from the newly installed new floor slab adjacent to the existing floor slab remaining on the bridge girder to the lower surface of the existing floor slab, and while being separated from the lower surface of the existing floor slab, the existing floor slab. It is a reinforcing structure at the time of replacement of the floor slab, which is provided with a bracket for supporting the downward load on the existing floor slab to the new floor slab by supporting the lower surface of the plate.

この構成によれば、橋桁の上に架設された既設床版の一部を撤去し、橋桁の上に残存する既設床版に隣接して新たに新設床版を設置する床版入替時の補強構造において、橋桁の上に残存する既設床版に隣接して新たに設置された新設床版から既設床版の下面へと延在するブラケットにより既設床版の下面が支持されることによって、既設床版に対する下方への荷重が既設床版よりも新しく強度に優れる新設床版により支持されるため、既設床版の下方への荷重に対する耐久力を向上させることができる。一方、ブラケットと既設床版の下面とは分離しているため、新設床版に対する下方への荷重は既設床版には伝達されず、新設床版の下方への荷重により既設床版に負担が生じることを防止することができる。 According to this configuration, a part of the existing floor slab erected on the bridge girder is removed, and a new floor slab is newly installed adjacent to the existing floor slab remaining on the bridge girder. In the structure, the lower surface of the existing floor slab is supported by a bracket extending from the newly installed new floor slab adjacent to the existing floor slab remaining on the bridge girder to the lower surface of the existing floor slab. Since the downward load on the floor slab is supported by the new floor slab, which is newer and stronger than the existing floor slab, the durability against the downward load of the existing floor slab can be improved. On the other hand, since the bracket and the lower surface of the existing floor slab are separated, the downward load on the new floor slab is not transmitted to the existing floor slab, and the downward load on the new floor slab imposes a burden on the existing floor slab. It can be prevented from occurring.

この場合、ブラケットは、既設床版の下面を支持する高さを変更可能な支持高度変更機構を有することが好適である。 In this case, it is preferable that the bracket has a support height changing mechanism capable of changing the height of supporting the lower surface of the existing floor slab.

この構成によれば、ブラケットは、支持高度変更機構により既設床版の下面を支持する高さを変更可能であるため、既設床版と新設床版との高低差や、既設床版の荷重による撓みの大きさ等に対応し易くなる。 According to this configuration, the height of the bracket that supports the lower surface of the existing floor slab can be changed by the support altitude changing mechanism, so that it depends on the height difference between the existing floor slab and the new floor slab and the load of the existing floor slab. It becomes easier to deal with the magnitude of deflection.

また、ブラケットは、新設床版の下方から突出した棒材と、棒材に固定され、新設床版の下面から既設床版の下面へと延在する張出材とを有し、張出材は、新設床版の下面に当接する新設床版当接面と、既設床版の下面とは分離しつつ、既設床版の下面に当接する既設床版当接面とを含むことが好適である。 Further, the bracket has a bar material protruding from below the new floor slab and an overhanging material fixed to the bar material and extending from the lower surface of the new floor slab to the lower surface of the existing floor slab. Is preferably including a new floor slab contact surface that contacts the lower surface of the new floor slab and an existing floor slab contact surface that contacts the lower surface of the existing floor slab while being separated from the lower surface of the existing floor slab. is there.

この構成によれば、ブラケットは、新設床版の下方から突出した棒材と、棒材に固定され、新設床版の下面から既設床版の下面へと延在する張出材とを有し、張出材は、新設床版の下面に当接する新設床版当接面と、既設床版の下面とは分離しつつ、既設床版の下面に当接する既設床版当接面とを含むため、既設床版当接面が力点として機能し、棒材と張出材との固定部が支点として機能し、新設床版当接面が作用点として機能することにより、単純な構造で既設床版に対する下方への荷重が新設床版に伝達されるようにすることができる。 According to this configuration, the bracket has a bar material protruding from below the new floor slab and an overhanging material fixed to the bar material and extending from the lower surface of the new floor slab to the lower surface of the existing floor slab. The overhanging material includes a new floor slab contact surface that contacts the lower surface of the new floor slab and an existing floor slab contact surface that contacts the lower surface of the existing floor slab while being separated from the lower surface of the existing floor slab. Therefore, the existing floor slab contact surface functions as a force point, the fixing part between the bar and the overhanging material functions as a fulcrum, and the new floor slab contact surface functions as an action point, so that the existing floor slab has a simple structure. The downward load on the slab can be transmitted to the new slab.

また、新設床版は、繊維補強コンクリート製プレキャスト床版、鋼床版、及び新設床版の下面に格子状の凸部によりその周囲を区画された複数の凹部を有するワッフル型繊維補強コンクリート製プレキャスト床版のいずれかであることが好適である。 In addition, the new floor slab is a precast fiber reinforced concrete plate, a steel plate bridge, and a waffle-type fiber reinforced concrete precast board having a plurality of recesses defined by grid-like protrusions on the lower surface of the new plate. It is preferably one of the floor slabs.

この構成によれば、新設床版は、繊維補強コンクリート製プレキャスト床版、鋼床版及びワッフル型繊維補強コンクリート製プレキャスト床版のいずれかであるため、新設床版の厚さを薄くし易く、新設床版の重量を軽くし易い。 According to this configuration, since the new floor slab is one of a fiber reinforced concrete precast plate bridge, a steel plate bridge and a waffle type fiber reinforced concrete precast plate bridge, it is easy to reduce the thickness of the new floor slab. It is easy to reduce the weight of the new floor slab.

また、本発明は、橋桁の上に架設された既設床版の一部を撤去する既設床版撤去工程と、既設床版撤去工程の後に橋桁の上に残存する既設床版に隣接して新たに新設床版を設置する新設床版設置工程と、新設床版設置工程で橋桁の上に残存する既設床版に隣接して新たに設置された新設床版から既設床版の下面へと延在し、既設床版の下面とは分離しつつ、既設床版の下面を支持するブラケットにより、既設床版に対する下方への荷重を新設床版に支持させる補強工程とを備えた床版入替方法である。 Further, the present invention is newly developed adjacent to the existing floor slab removing step of removing a part of the existing floor slab erected on the bridge girder and the existing floor slab remaining on the bridge girder after the existing floor slab removing step. The new floor slab installation process to install the new floor slab and the new floor slab newly installed adjacent to the existing floor slab remaining on the bridge girder in the new floor slab installation process extend to the underside of the existing floor slab. A method of replacing the floor slab, which is separated from the lower surface of the existing floor slab and has a reinforcing process for supporting the downward load on the existing floor slab by the bracket that supports the lower surface of the existing floor slab. Is.

この場合、補強工程では、既設床版の下面を支持する高さを変更可能な支持高度変更機構を有するブラケットにより、既設床版に対する下方への荷重を新設床版に支持させることが好適である。 In this case, in the reinforcement step, it is preferable to support the new floor slab with a downward load on the existing floor slab by a bracket having a support height changing mechanism that can change the height of supporting the lower surface of the existing floor slab. ..

また、補強工程では、新設床版の下方から突出した棒材と、棒材に固定され、新設床版の下面から既設床版の下面へと延在する張出材とを有し、張出材は、新設床版の下面に当接する新設床版当接面と、既設床版の下面とは分離しつつ、既設床版の下面に当接する既設床版当接面とを含むブラケットにより、既設床版に対する下方への荷重を新設床版に支持させることが好適である。 Further, in the reinforcement process, there is a bar material protruding from below the new floor slab and an overhanging material fixed to the bar material and extending from the lower surface of the new floor slab to the lower surface of the existing floor slab. The material is formed by a bracket including a new floor slab contact surface that contacts the lower surface of the new floor slab and an existing floor slab contact surface that contacts the lower surface of the existing floor slab while being separated from the lower surface of the existing floor slab. It is preferable that the new floor slab supports the downward load on the existing floor slab.

また、新設床版設置工程では、繊維補強コンクリート製プレキャスト床版、鋼床版、及び新設床版の下面に格子状の凸部によりその周囲を区画された複数の凹部を有するワッフル型繊維補強コンクリート製プレキャスト床版のいずれかの新設床版を設置することが好適である。 Further, in the new floor slab installation process, a waffle-type fiber reinforced concrete having a precast slab made of fiber reinforced concrete, a steel slab, and a plurality of recesses on the lower surface of the new floor slab, which are partitioned by grid-like convex portions. It is preferable to install a new floor slab of any of the precast floor slabs manufactured by the company.

この場合、新設床版設置工程では、新設床版設置工程で設置した１枚のワッフル型繊維補強コンクリート製プレキャスト床版に隣接してもう１枚のワッフル型繊維補強コンクリート製プレキャスト床版を設置し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版の互いに隣接する凸部のそれぞれにボルトを挿通し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版の隙間に硬化材を注入することにより、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版のそれぞれを一体化させることが好適である。 In this case, in the new floor slab installation process, another waffle-type fiber reinforced concrete precast floor slab is installed adjacent to the one waffle-type fiber reinforced concrete precast floor slab installed in the new floor slab installation process. By inserting bolts into each of the adjacent protrusions of the waffle-type fiber reinforced concrete precast slabs adjacent to each other and injecting a hardening material into the gaps between the waffle-type fiber reinforced concrete precast slabs adjacent to each other. It is preferable to integrate each of the waffle-type fiber reinforced concrete precast floor slabs adjacent to each other.

この構成によれば、新設床版設置工程では、新設床版設置工程で設置した１枚のワッフル型補強コンクリート製プレキャスト床版に隣接してもう１枚のワッフル型繊維補強コンクリート製プレキャスト床版を設置し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版の互いに隣接する凸部のそれぞれにボルトを挿通し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版の隙間に硬化材を注入することにより、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版のそれぞれを一体化させるため、新設床版同士の接合を迅速に行うことができる。 According to this configuration, in the new floor slab installation process, another waffle-type fiber reinforced concrete precast floor slab is placed adjacent to one waffle-type reinforced concrete precast floor slab installed in the new floor slab installation process. Install and insert bolts into each of the adjacent protrusions of the waffle-type fiber reinforced concrete precast slabs adjacent to each other, and inject the hardening material into the gaps between the waffle-type fiber reinforced concrete precast slabs adjacent to each other. As a result, each of the waffle-type fiber reinforced concrete precast floor slabs adjacent to each other is integrated, so that the new floor slabs can be joined quickly.

また、既設床版撤去工程では、橋桁の上に架設された既設床版を橋軸直角方向に作業帯と車両が通行可能な通行帯とに分割し、作業帯の既設床版の一部を撤去し、新設床版設置工程では、既設床版撤去工程で既設床版を撤去された作業帯に残存する既設床版に隣接して新たに新設床版を設置することが好適である。 In the process of removing the existing plate slab, the existing plate erected on the bridge girder is divided into a work zone and a passage zone through which vehicles can pass in the direction perpendicular to the bridge axis, and a part of the existing floor slab of the work zone is divided. In the removal and new floor slab installation process, it is preferable to newly install a new floor slab adjacent to the existing floor slab remaining in the work zone from which the existing floor slab was removed in the existing floor slab removal step.

この構成によれば、既設床版撤去工程では、橋桁の上に架設された既設床版を橋軸直角方向に作業帯と車両が通行可能な通行帯とに分割し、作業帯の既設床版の一部を撤去し、新設床版設置工程では、既設床版撤去工程で既設床版を撤去された作業帯に残存する既設床版に隣接して新たに新設床版を設置するため、既設床版撤去工程や新設床版設置工程が行われない通行帯では車両を通行させることができ、交通量の低下を抑制することができる。 According to this configuration, in the existing floor slab removal process, the existing floor slab erected on the bridge girder is divided into a work zone and a passage zone through which vehicles can pass in the direction perpendicular to the bridge axis, and the existing floor slab of the work zone is divided. In the new floor slab installation process, a new floor slab is installed adjacent to the existing floor slab remaining in the work zone where the existing floor slab was removed in the existing floor slab removal process. Vehicles can pass through the lane where the plate removal process and the new plate installation process are not performed, and the decrease in traffic volume can be suppressed.

本発明の床版入替時の補強構造及び床版入替方法によれば、既設床版の下方への荷重に対する耐久力を向上させることができる。 According to the reinforcing structure at the time of replacing the floor slab and the method of replacing the floor slab of the present invention, it is possible to improve the durability of the existing floor slab against a downward load.

実施形態の床版入替時の補強構造及び床版入替方法が適用される橋梁に仮防護柵が設置された状態を示す斜視図である。It is a perspective view which shows the state which the temporary guard fence is installed in the bridge to which the reinforcement structure at the time of the floor slab replacement and the floor slab replacement method of the embodiment are applied. 図１の橋梁において実施形態の床版入替方法の既設床版撤去工程が行われる状態を示す横断面図である。It is sectional drawing which shows the state which the existing floor slab removal process of the floor slab replacement method of embodiment is performed on the bridge of FIG. 実施形態の床版入替方法の既設床版撤去工程が行われる状態を示す斜視図である。It is a perspective view which shows the state which the existing floor slab removal process is performed of the floor slab replacement method of embodiment. 実施形態の床版入替方法の新設床版設置工程及び補強工程が行われる状態を示す横断面図である。It is a cross-sectional view which shows the state which the new floor slab installation process and the reinforcement process are performed of the floor slab replacement method of embodiment. 図２の橋梁において実施形態の床版入替方法の新設床版設置工程及び補強工程が行われる状態を示す斜視図である。It is a perspective view which shows the state in which the new floor slab installation process and the reinforcement process of the floor slab replacement method of embodiment are performed in the bridge of FIG. 実施形態の床版入替方法の新設床版設置工程で設置される新設床版であるワッフル型繊維補強コンクリート製プレキャスト床版の一の態様を示す底面図である。It is a bottom view which shows one aspect of the precast floor slab made of waffle type fiber reinforced concrete which is the new floor slab installed in the new floor slab installation process of the floor slab replacement method of embodiment. 実施形態の床版入替時の補強構造のブラケットを示す斜視図である。It is a perspective view which shows the bracket of the reinforcement structure at the time of the floor slab replacement of an embodiment. 実施形態の床版入替時の補強構造のブラケットを示す図６のα線による断面図である。FIG. 6 is a cross-sectional view taken along the line α of FIG. 6 showing a bracket of a reinforcing structure when the floor slab is replaced according to the embodiment. 実施形態の床版入替時の補強構造の新設床版設置工程で互いに隣接して設置される新設床版であるワッフル型繊維補強コンクリート製プレキャスト床版を示す図６のβ線による断面図である。It is sectional drawing by β line of FIG. 6 which shows the precast floor slab made of waffle type fiber reinforced concrete which is the new floor slab installed adjacent to each other in the new floor slab installation process of the reinforcement structure at the time of floor slab replacement of embodiment. .. 実施形態の床版入替方法の新設床版設置工程で設置される新設床版であるワッフル型繊維補強コンクリート製プレキャスト床版の他の態様を示す底面図である。It is a bottom view which shows the other aspect of the precast floor slab made of waffle type fiber reinforced concrete which is the new floor slab installed in the new floor slab installation process of the floor slab replacement method of embodiment. 実施形態の床版入替時の補強構造の新設床版設置工程で互いに隣接して設置される新設床版であるワッフル型繊維補強コンクリート製プレキャスト床版を示す図１０のγ線による断面図である。FIG. 5 is a cross-sectional view taken along line γ showing a precast floor slab made of waffle-type fiber reinforced concrete, which is a new floor slab installed adjacent to each other in the new floor slab installation step of the reinforcing structure at the time of replacing the floor slab of the embodiment. .. 実施形態の床版入替方法の補強工程で実施形態の床版入替時の補強構造のブラケットを作業帯に設置された新設床版と通行帯の既設床版との間に適用した状態を示す横断面図である。In the reinforcement process of the floor slab replacement method of the embodiment, a cross section showing a state in which the bracket of the reinforcing structure at the time of floor slab replacement of the embodiment is applied between the new floor slab installed in the work zone and the existing floor slab of the passage zone. It is a top view. 実施形態の床版入替方法の補強工程で作業帯に設置された新設床版に隣接する通行帯の既設床版を橋桁に取付けられた支持材で支持した状態を示す横断面図である。It is a cross-sectional view which shows the state which supported the existing floor slab of the passage zone adjacent to the new floor slab installed in the work zone by the support material attached to the bridge girder in the reinforcement process of the floor slab replacement method of embodiment. 図５の仮防護柵を移設し、作業帯と通行帯とを入れ替えた状態を示す斜視図である。It is a perspective view which shows the state which the temporary guard fence of FIG. 5 was relocated, and the work zone and the passage zone were exchanged. 図１４の橋梁において実施形態の床版入替方法の既設床版撤去工程が行われる状態を示す横断面図である。FIG. 3 is a cross-sectional view showing a state in which an existing floor slab removing step of the floor slab replacement method of the embodiment is performed on the bridge of FIG. 図１５の橋梁において実施形態の床版入替方法の新設床版設置工程及び補強工程が行われる状態を示す斜視図である。FIG. 5 is a perspective view showing a state in which a new floor slab installation step and a reinforcement step of the floor slab replacement method of the embodiment are performed on the bridge of FIG.

以下、図面を参照しつつ本発明に係る床版入替時の補強構造及び床版入替方法について詳細に説明する。図１に示すように、本発明の実施形態に係る床版入替時の補強構造及び床版入替方法は、例えば、夜間の交通量が少なくなる時間帯において、橋梁１の橋桁２の上に架設された既設床版３の一部を撤去し、橋桁２の上に残存する既設床版３に隣接して新たに新設床版を設置する床版入替時に適用される。日中の交通量が多くなる時間帯においては、新設床版が設置された区間や、新設床版に隣接する既設床版３の区間に車両を通行させることにより、交通量への低下を抑制する。 Hereinafter, the reinforcing structure and the floor slab replacement method at the time of floor slab replacement according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the reinforcing structure and the plate replacement method at the time of plate replacement according to the embodiment of the present invention are erected on the bridge girder 2 of the bridge 1 during a time when the traffic volume at night is low, for example. This is applied when replacing a floor slab by removing a part of the existing floor slab 3 and installing a new floor slab adjacent to the existing floor slab 3 remaining on the bridge girder 2. During times of heavy traffic during the day, vehicles can pass through the section where the new floor slab is installed and the section of the existing floor slab 3 adjacent to the new floor slab to suppress the decrease in traffic volume. To do.

図１、図２及び図３に示すように、本実施形態の床版入替方法では、橋桁２の上に架設された既設床版３の一部を撤去する既設床版撤去工程が行われる。既設床版撤去工程では、壁高欄４と壁高欄５との間に橋軸方向Ｘに沿って仮防護柵６を設置することにより、橋桁２の上に架設された既設床版３を橋軸直角方向Ｙに作業帯７と車両Ｖが通行可能な通行帯８とに分割し、作業帯７の既設床版３の一部及び壁高欄４の一部を撤去する。 As shown in FIGS. 1, 2 and 3, in the floor slab replacement method of the present embodiment, an existing floor slab removing step of removing a part of the existing floor slab 3 erected on the bridge girder 2 is performed. In the existing floor slab removal process, a temporary guard fence 6 is installed between the wall rail 4 and the wall rail 5 along the bridge axis direction X, so that the existing floor slab 3 erected on the bridge girder 2 is mounted on the bridge shaft. The work zone 7 and the passage zone 8 through which the vehicle V can pass are divided in the perpendicular direction Y, and a part of the existing floor slab 3 and a part of the wall railing 4 of the work zone 7 are removed.

図２に示すように、既設床版３の一部の撤去に先立って、橋桁２は補強ケーブル９により補強される。また、既設床版３の一部の撤去に先立って、橋桁２及び既設床版３は、不図示の補強手段により補強される。既設床版撤去工程で一度に撤去される既設床版３の一部の橋軸方向Ｘの長さは、例えば、１ｍ〜３ｍであり、２．５ｍにできる。 As shown in FIG. 2, the bridge girder 2 is reinforced by the reinforcing cable 9 prior to the removal of a part of the existing floor slab 3. Further, prior to the removal of a part of the existing floor slab 3, the bridge girder 2 and the existing floor slab 3 are reinforced by reinforcing means (not shown). The length of a part of the existing floor slab 3 that is removed at one time in the existing floor slab removing step in the bridge axial direction X is, for example, 1 m to 3 m, and can be 2.5 m.

図４、図５及び図６に示すように、既設床版撤去工程の後に橋桁２の上に残存する既設床版３に隣接して新たに新設床版３０及び壁高欄４０を設置する新設床版設置工程が行われる。新設床版設置工程では、既設床版撤去工程で既設床版３を撤去された作業帯７に残存する既設床版３に隣接して新たに新設床版３０が設置される。 As shown in FIGS. 4, 5 and 6, a new floor slab 30 and a wall balustrade 40 are newly installed adjacent to the existing floor slab 3 remaining on the bridge girder 2 after the existing floor slab removal process. The plate installation process is performed. In the new floor slab installation process, a new floor slab 30 is newly installed adjacent to the existing floor slab 3 remaining in the work zone 7 from which the existing floor slab 3 was removed in the existing floor slab removal process.

新設床版設置工程では、例えば、繊維補強コンクリート製プレキャスト床版、鋼床版及びワッフル型繊維補強コンクリート製プレキャスト床版３１ａのいずれかの新設床版３０を設置する。本実施形態では、新設床版３０としてワッフル型繊維補強コンクリート製プレキャスト床版３１ａを設置する。繊維補強コンクリートは、コンクリートに、数ｍｍ〜数十ｍｍに切断された合成繊維や鋼繊維等の補強繊維が混入されている。例えば、本実施形態の繊維補強コンクリート製プレキャスト床版及びワッフル型繊維補強コンクリート製プレキャスト床版３１ａの繊維補強コンクリートは、材令２８日における圧縮強度が１００〜４００Ｎ／ｍｍ２である。 In the new floor slab installation step, for example, a new floor slab 30 made of any one of a fiber reinforced concrete precast floor slab, a steel floor slab and a waffle type fiber reinforced concrete precast floor slab 31a is installed. In the present embodiment, a waffle type fiber reinforced concrete precast floor slab 31a is installed as the new floor slab 30. In fiber reinforced concrete, reinforcing fibers such as synthetic fibers and steel fibers cut into several mm to several tens of mm are mixed in the concrete. For example, the fiber-reinforced concrete of the fiber-reinforced concrete precast floor slab and the waffle-type fiber-reinforced concrete precast floor slab 31a of the present embodiment has a compressive strength of 100 to 400 N / mm 2 on the 28th day of the material age.

図６に示すように、ワッフル型繊維補強コンクリート製プレキャスト床版３１ａは、新設床版３０の下面３０ｓに格子状の凸部３２によりその周囲を区画された複数の凹部３３を有する。また、図６及び図７に示すように、ワッフル型繊維補強コンクリート製プレキャスト床版３１ａは、ワッフル型繊維補強コンクリート製プレキャスト床版３１ａの橋軸方向Ｘの両端部に凹部であるせん断キー３４と凸部であるせん断キー３５とをそれぞれ有する。 As shown in FIG. 6, the waffle-type fiber reinforced concrete precast floor slab 31a has a plurality of recesses 33 defined on the lower surface 30s of the new floor slab 30 by a grid-like convex portion 32. Further, as shown in FIGS. 6 and 7, the waffle-type fiber reinforced concrete precast floor slab 31a has shear keys 34 which are recesses at both ends of the waffle-type fiber reinforced concrete precast floor slab 31a in the bridge axial direction X. Each has a shear key 35 which is a convex portion.

図４、図６、図７及び図８に示すように、本実施形態の床版入替方法では、新設床版設置工程で橋桁２の上に残存する既設床版３に隣接して新たに設置された新設床版３０から既設床版３の下面３ｓへと延在し、既設床版３の下面３ｓとは分離しつつ、既設床版３の下面３ｓを支持するブラケット１０により、既設床版３に対する下方への荷重を新設床版３０に支持させる補強工程が行われる。つまり、図７及び図８に示すように、本実施形態の床版入替時の補強構造１００では、既設床版３に対する下方への荷重を新設床版３０に支持させるブラケット１０を備える。 As shown in FIGS. 4, 6, 7, and 8, in the floor slab replacement method of the present embodiment, the floor slab is newly installed adjacent to the existing floor slab 3 remaining on the bridge girder 2 in the new floor slab installation process. The existing floor slab extends from the new floor slab 30 to the lower surface 3s of the existing floor slab 3, and is separated from the lower surface 3s of the existing floor slab 3 by the bracket 10 that supports the lower surface 3s of the existing floor slab 3. A reinforcing step is performed in which the new floor slab 30 supports the downward load with respect to 3. That is, as shown in FIGS. 7 and 8, the reinforcing structure 100 at the time of replacing the floor slab of the present embodiment includes a bracket 10 for supporting the downward load on the existing floor slab 3 on the new floor slab 30.

図７及び図８に示すように、ブラケット１０は、新設床版３０であるワッフル型繊維補強コンクリート製プレキャスト床版３１ａの下方から突出した棒材１１と、棒材１１に固定され、新設床版３０の下面３０ｓから既設床版３の下面３ｓへと延在する張出材１２とを有する。張出材１２は、新設床版３０の下面３０ｓに当接する新設床版当接面１３と、既設床版３の下面３ｓとは分離しつつ、既設床版３の下面３ｓに当接する既設床版当接面１４とを含む。 As shown in FIGS. 7 and 8, the bracket 10 is fixed to the new floor slab 30 and the bar 11 protruding from below the waffle type fiber reinforced concrete precast floor slab 31a, and is fixed to the new floor slab. It has an overhanging material 12 extending from the lower surface 30s of the 30 to the lower surface 3s of the existing floor slab 3. The overhanging material 12 is an existing floor that abuts on the lower surface 3s of the existing floor slab 3 while being separated from the new floor slab contact surface 13 that abuts on the lower surface 30s of the new floor slab 30 and the lower surface 3s of the existing floor slab 3. Includes a plate contact surface 14.

棒材１１は、例えば、鋼棒である。棒材１１は、その上端及びその下端にネジ溝１１ｓを含む。棒材１１の上端のネジ溝１１ｓが新設床版３０に埋設されたナット３０ｎに捩じ込まれることにより、棒材１１は、新設床版３０の下方に吊り下げられる。 The bar 11 is, for example, a steel bar. The bar 11 includes a thread groove 11s at its upper end and its lower end. By screwing the screw groove 11s at the upper end of the bar 11 into the nut 30n embedded in the new floor slab 30, the bar 11 is suspended below the new floor slab 30.

張出材１２は、その長手方向が橋軸方向Ｘと平行であるＨ形鋼であり、その上端のフランジとその下端のフランジとの間に補強用のリブ１２ｒを含む。張出材１２は、その上端のフランジ及びその下端のフランジに棒材１１が挿通されるための孔部１２ｈを含む。張出材１２は、その上端のフランジの上面において、新設床版３０の側に取付けられた新設床版側部材１６と、既設床版３の側に取付けられた既設床版側部材１７とを含む。 The overhanging material 12 is an H-shaped steel whose longitudinal direction is parallel to the bridge axial direction X, and includes a reinforcing rib 12r between the flange at the upper end thereof and the flange at the lower end thereof. The overhanging material 12 includes a hole portion 12h for inserting the rod member 11 into the flange at the upper end thereof and the flange at the lower end thereof. The overhanging material 12 has a new floor slab side member 16 attached to the side of the new floor slab 30 and an existing floor slab side member 17 attached to the side of the existing floor slab 3 on the upper surface of the flange at the upper end thereof. Including.

新設床版側部材１６及び既設床版側部材１７は、その長手方向が橋軸直角方向Ｙと平行であるＨ形鋼である。新設床版側部材１６は、その上端のフランジとその下端のフランジとの間に補強用のリブ１６ｒを含む。既設床版側部材１７は、その上端のフランジとその下端のフランジとの間に補強用のリブ１７ｒを含む。新設床版側部材１６は、その上端のフランジの上面に新設床版３０の下面３０ｓの凹凸に対応するためのゴム板１６ｇを含み、ゴム板１６ｇの上面により新設床版当接面１３が形成される。既設床版側部材１７は、その上端のフランジの上面に既設床版３の下面３ｓの凹凸に対応するためのゴム板１７ｇを含み、ゴム板１７ｇの上面により既設床版当接面１４が形成される。 The new floor slab side member 16 and the existing floor slab side member 17 are H-shaped steel whose longitudinal direction is parallel to the direction Y perpendicular to the bridge axis. The new floor slab side member 16 includes a reinforcing rib 16r between the flange at the upper end thereof and the flange at the lower end thereof. The existing floor slab side member 17 includes a reinforcing rib 17r between the flange at the upper end thereof and the flange at the lower end thereof. The new floor slab side member 16 includes a rubber plate 16 g on the upper surface of the flange at the upper end thereof to cope with the unevenness of the lower surface 30s of the new floor slab 30, and the new floor slab contact surface 13 is formed by the upper surface of the rubber plate 16 g. Will be done. The existing floor slab side member 17 includes a rubber plate 17 g on the upper surface of the flange at the upper end thereof to cope with the unevenness of the lower surface 3s of the existing floor slab 3, and the existing floor slab contact surface 14 is formed by the upper surface of the rubber plate 17 g. Will be done.

棒材１１が張出材１２の孔部１２ｈに挿通され、棒材１１の下端のネジ溝１１ｓにナット１１ｎが固定されることにより、棒材１１を介して張出材１２が新設床版３０の下方に吊り下げされる。新設床版３０の下面３０ｓと新設床版当接面１３とは、互いに接触していてもよく、互いに間隔を隔てて接触していなくてもよい。新設床版３０の下面３０ｓと新設床版当接面１３とは、一体化されていてもよく、分離していてもよい。既設床版３の下面３ｓと既設床版当接面１４とは、互いに接触していてもよく、互いに間隔を隔てて接触していなくてもよい。しかし、既設床版３の下面３ｓと既設床版当接面１４とは、一体化されておらず、分離している。 The bar 11 is inserted into the hole 12h of the overhanging material 12, and the nut 11n is fixed to the screw groove 11s at the lower end of the bar 11 so that the overhanging material 12 is newly installed on the floor slab 30 via the bar 11. Suspended below. The lower surface 30s of the new floor slab 30 and the new floor slab contact surface 13 may be in contact with each other, or may not be in contact with each other at intervals. The lower surface 30s of the new floor slab 30 and the new floor slab contact surface 13 may be integrated or separated. The lower surface 3s of the existing floor slab 3 and the existing floor slab contact surface 14 may be in contact with each other, or may not be in contact with each other at intervals. However, the lower surface 3s of the existing floor slab 3 and the existing floor slab contact surface 14 are not integrated and are separated.

棒材１１の下端のネジ溝１１ｓにナット１１ｎが固定される位置を変更することにより、棒材１１を介して張出材１２が新設床版３０の下方に吊り下げされる高さ及び既設床版当接面１４の高さを変更自在である。つまり、本実施形態のブラケット１０は、既設床版３の下面３ｓを支持する高さを変更可能な支持高度変更機構１５を有し、棒材１１の下端のネジ溝１１ｓ及びナット１１ｎは支持高度変更機構１５として機能する。 By changing the position where the nut 11n is fixed to the screw groove 11s at the lower end of the bar material 11, the height at which the overhanging material 12 is suspended below the new floor slab 30 via the bar material 11 and the existing floor The height of the plate contact surface 14 can be changed freely. That is, the bracket 10 of the present embodiment has a support height changing mechanism 15 capable of changing the height of supporting the lower surface 3s of the existing floor slab 3, and the screw groove 11s and the nut 11n at the lower end of the bar 11 have a support height. It functions as a change mechanism 15.

新設床版側部材１６及び既設床版側部材１７のそれぞれの橋軸直角方向Ｙに沿った長手方向の長さは例えば０．２ｍ〜１ｍである。ブラケット１０は、既設床版３への下方への荷重が最も大きい部位であるトラック等の大型車両の左右の車輪が通過する位置付近の２箇所に設置されていればよい。また、ブラケット１０は、新設床版３０及び既設床版３への下方への荷重による撓みが最も大きい部位である既設床版３の橋軸直角方向Ｙの中央の位置に設置されていてもよい。なお、新設床版側部材１６及び既設床版側部材１７のそれぞれは、その長手方向が橋軸直角方向Ｙに沿って新設床版３０及び既設床版３の全幅に亘って延在していてもよい。 The length of each of the new floor slab side member 16 and the existing floor slab side member 17 in the longitudinal direction along the bridge axis perpendicular direction Y is, for example, 0.2 m to 1 m. The brackets 10 may be installed at two locations near the positions where the left and right wheels of a large vehicle such as a truck, which is the portion where the downward load on the existing floor slab 3 is greatest, passes. Further, the bracket 10 may be installed at a position at the center of the existing floor slab 3 in the direction perpendicular to the bridge axis Y, which is a portion where the deflection due to the downward load on the new floor slab 30 and the existing floor slab 3 is the largest. .. Each of the new floor slab side member 16 and the existing floor slab side member 17 extends in the longitudinal direction along the bridge axis perpendicular direction Y over the entire width of the new floor slab 30 and the existing floor slab 3. May be good.

補強工程においてブラケット１０が設置される際には、例えば、新設床版設置工程において、下面３０ｓから棒材１１が吊り下げられた新設床版３０を設置し、新設床版３０の下方に設置された足場を利用して、張出材１２を棒材１１の下端にナット１１ｎにより取り付けることにより、ブラケット１０を設置することができる。ブラケット１０の設置の際には、新設床版３０の下方に設置されていた吸音板を足場として用いてもよい。 When the bracket 10 is installed in the reinforcing process, for example, in the new floor slab installation process, the new floor slab 30 in which the bar 11 is suspended from the lower surface 30s is installed and installed below the new floor slab 30. The bracket 10 can be installed by attaching the overhanging member 12 to the lower end of the bar 11 with a nut 11n using the scaffolding. When installing the bracket 10, the sound absorbing plate installed below the new floor slab 30 may be used as a scaffold.

上記のような既設床版撤去工程、新設床版設置工程及び補強工程が繰り返されることにより、既設床版３の一部ずつ既設床版３が新設床版３０に入れ替えられる。既設床版撤去工程、新設床版設置工程及び補強工程は夜間の交通量が少なくなる時間帯に行われ、当該時間帯の最後の新設床版設置工程で設置された新設床版３０に隣接する既設床版３に対する補強工程が完了した段階で中断される。日中の交通量が多くなる時間帯においては、作業帯７の新設床版３０が設置された区間や新設床版３０に隣接する既設床版３の区間にも車両が通行させられる。 By repeating the existing floor slab removal step, the new floor slab installation step, and the reinforcement step as described above, the existing floor slab 3 is replaced with the new floor slab 30 part by part of the existing floor slab 3. The existing plate removal process, the new plate installation process, and the reinforcement process are performed during the time when the traffic volume at night is low, and are adjacent to the new plate 30 installed in the last new plate installation process during that time. It is interrupted when the reinforcement process for the existing floor slab 3 is completed. During the time when the traffic volume during the daytime is heavy, vehicles are allowed to pass through the section where the new floor slab 30 of the work zone 7 is installed and the section of the existing floor slab 3 adjacent to the new floor slab 30.

ブラケット１０がその下面３ｓを支持していた既設床版３が新設床版３０に入れ替えられた後は、補強工程で設置されたブラケット１０は設置されたままにしてもよく、撤去されてもよい。ブラケット１０が撤去される際には、ナット１１ｎを取り外すことにより張出材１２を棒材１１から取り外し、棒材１１の上端のネジ溝１１ｓを新設床版３０に埋設されたナット３０ｎから取り外すことにより、ブラケット１０を撤去することができる。また、ブラケット１０が撤去される際には、棒材１１を溶断することにより、ブラケットを撤去してもよい。 After the existing floor slab 3 on which the bracket 10 supports the lower surface 3s is replaced with the new floor slab 30, the bracket 10 installed in the reinforcing step may be left installed or removed. .. When the bracket 10 is removed, the overhanging material 12 is removed from the bar material 11 by removing the nut 11n, and the screw groove 11s at the upper end of the bar material 11 is removed from the nut 30n embedded in the new floor slab 30. The bracket 10 can be removed. Further, when the bracket 10 is removed, the bracket may be removed by fusing the bar 11.

既設床版撤去工程、新設床版設置工程及び補強工程が繰り返されることにより、図９に示すように、新設床版設置工程では、新設床版設置工程で設置した１枚のワッフル型繊維補強コンクリート製プレキャスト床版３１ａに隣接してもう１枚のワッフル型繊維補強コンクリート製プレキャスト床版３１ａが互いのせん断キー３４，３５を嵌合させつつ設置される。新設床版設置工程では、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ａの互いに隣接する凸部３２のそれぞれにボルト３６を挿通し、当該凸部３２によりその周囲を区画された凹部３３の中に突出したボルト３６の両端をナット３６ｎにより固定することによって、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ａのそれぞれが一体化させされる。 By repeating the existing floor slab removal process, the new floor slab installation process, and the reinforcement process, as shown in FIG. 9, in the new floor slab installation process, one waffle-type fiber reinforced concrete installed in the new floor slab installation process. Another waffle-type fiber reinforced concrete precast slab 31a is installed adjacent to the precast slab 31a made by fitting the shear keys 34 and 35 to each other. In the new floor slab installation process, bolts 36 are inserted into each of the convex portions 32 of the precast floor slabs 31a made of waffle-type fiber reinforced concrete adjacent to each other, and the recesses 33 having their periphery partitioned by the convex portions 32 are inserted. By fixing both ends of the bolt 36 protruding inward with nuts 36n, each of the waffle-type fiber reinforced concrete precast slabs 31a adjacent to each other is integrated.

また、図１０及び図１１に示すように、新設床版設置工程で設置した１枚のワッフル型繊維補強コンクリート製プレキャスト床版３１ｂに隣接してもう１枚のワッフル型繊維補強コンクリート製プレキャスト床版３１ｂが、橋桁２の一部であるウェブ２１又は横リブ２２の上端から突出した接続板２３を間に挟んで間隔を隔てつつ設置されてもよい。互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ｂの互いに隣接する凸部３２のそれぞれにボルト３６を挿通し、当該凸部３２によりその周囲を区画された凹部３３の中に突出したボルト３６の両端をナット３６ｎにより固定し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ｂの隙間に硬化材３７を注入することにより、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ｂのそれぞれが一体化させられてもよい。 Further, as shown in FIGS. 10 and 11, another waffle-type fiber-reinforced concrete precast floor slab adjacent to one waffle-type fiber-reinforced concrete precast floor slab 31b installed in the new floor slab installation process. 31b may be installed at intervals with a connecting plate 23 protruding from the upper end of the web 21 or the lateral rib 22 which is a part of the bridge girder 2 in between. Bolts 36 are inserted into each of the convex portions 32 of the waffle-type fiber reinforced concrete precast floor slabs 31b adjacent to each other, and the bolts 36 projecting into the concave portions 33 surrounded by the convex portions 32. By fixing both ends with nuts 36n and injecting the curing material 37 into the gaps between the waffle-type fiber reinforced concrete precast slabs 31b adjacent to each other, each of the waffle-type fiber reinforced concrete precast slabs 31b adjacent to each other is integrated. It may be made into concrete.

なお、図１２に示すように、上記のような本実施形態の床版入替方法の補強工程で本実施形態の床版入替時の補強構造１００のブラケット１０を作業帯７に設置された新設床版３０と通行帯８の既設床版３との間に適用してもよい。もし、橋桁２のフランジが障害となり、ブラケット１０の設置が困難である場合には、図１３に示すように、橋桁２に取付けられた支持材６０により通行帯８の既設床版３の下面３ｓを支持してもよい。 As shown in FIG. 12, in the reinforcement step of the floor slab replacement method of the present embodiment as described above, the bracket 10 of the reinforcement structure 100 at the time of replacement of the floor slab of the present embodiment is installed in the work zone 7. It may be applied between the plate 30 and the existing floor plate 3 of the lane 8. If the flange of the bridge girder 2 becomes an obstacle and it is difficult to install the bracket 10, as shown in FIG. 13, the support member 60 attached to the bridge girder 2 provides the lower surface 3s of the existing floor slab 3 of the passage zone 8. May be supported.

既設床版撤去工程、新設床版設置工程及び補強工程が繰り返されることにより、作業帯７の既設床版３の全部が新設床版３０に入れ替えられた後には、図１４に示すように、仮防護柵６を移設し、作業帯７と通行帯８とが入れ替えられる。図１５に示すように、上記と同様に既設床版撤去工程により、作業帯７の既設床版３の一部及び壁高欄５の一部が撤去される。図１６に示すように、上記と同様の新設床版設置工程及び補強工程により、橋桁２の上に残存する既設床版３に隣接して新たに新設床版３０及び壁高欄５０が設置される。作業帯７の既設床版３の全部が新設床版３０に入れ替えられるまで、既設床版撤去工程、新設床版設置工程及び補強工程が繰り返される。 After the existing floor slab removal process, the new floor slab installation process, and the reinforcement process are repeated and all of the existing floor slab 3 of the work zone 7 is replaced with the new floor slab 30, as shown in FIG. The guard fence 6 is relocated, and the work zone 7 and the passage zone 8 are replaced. As shown in FIG. 15, a part of the existing floor slab 3 and a part of the wall balustrade 5 of the work zone 7 are removed by the existing floor slab removing step in the same manner as described above. As shown in FIG. 16, a new floor slab 30 and a wall balustrade 50 are newly installed adjacent to the existing floor slab 3 remaining on the bridge girder 2 by the new floor slab installation process and the reinforcement process similar to the above. .. The existing floor slab removal step, the new floor slab installation step, and the reinforcement step are repeated until all of the existing floor slab 3 of the work zone 7 is replaced with the new floor slab 30.

本実施形態によれば、橋桁２の上に架設された既設床版３の一部を撤去し、橋桁２の上に残存する既設床版３に隣接して新たに新設床版３０を設置する床版入替時の補強構造１００において、橋桁２の上に残存する既設床版３に隣接して新たに設置された新設床版３０から既設床版３の下面３ｓへと延在するブラケット１０により既設床版３の下面３ｓが支持されることによって、既設床版３に対する下方への荷重が既設床版３よりも新しく強度に優れる新設床版３０により支持されるため、既設床版３の下方への荷重に対する耐久力を向上させることができる。一方、ブラケット１０と既設床版３の下面３ｓとは分離しているため、新設床版３０に対する下方への荷重は既設床版３には伝達されず、新設床版３０の下方への荷重により既設床版３に負担が生じることを防止することができる。 According to the present embodiment, a part of the existing floor slab 3 erected on the bridge girder 2 is removed, and a new floor slab 30 is newly installed adjacent to the existing floor slab 3 remaining on the bridge girder 2. In the reinforcing structure 100 at the time of replacement of the floor slab, the bracket 10 extending from the newly installed floor slab 30 newly installed adjacent to the existing floor slab 3 remaining on the bridge girder 2 to the lower surface 3s of the existing floor slab 3 Since the lower surface 3s of the existing floor slab 3 is supported, the downward load on the existing floor slab 3 is supported by the new floor slab 30, which is newer and stronger than the existing floor slab 3, and therefore is below the existing floor slab 3. It is possible to improve the durability against a load on the bridge. On the other hand, since the bracket 10 and the lower surface 3s of the existing floor slab 3 are separated, the downward load on the new floor slab 30 is not transmitted to the existing floor slab 3, and the downward load on the new floor slab 30 causes it. It is possible to prevent the existing floor slab 3 from being burdened.

また、本実施形態によれば、ブラケット１０は、支持高度変更機構１５により既設床版３の下面３ｓを支持する高さを変更可能であるため、既設床版３と新設床版３０との高低差や、既設床版３の荷重による撓みの大きさ等に対応し易くなる。 Further, according to the present embodiment, the height of the bracket 10 that supports the lower surface 3s of the existing floor slab 3 can be changed by the support altitude changing mechanism 15, so that the height of the existing floor slab 3 and the new floor slab 30 is high or low. It becomes easy to deal with the difference and the magnitude of bending due to the load of the existing floor slab 3.

また、本実施形態によれば、ブラケット１０は、新設床版３０の下方から突出した棒材１１と、棒材１１に固定され、新設床版３０の下面３０ｓから既設床版３の下面３ｓへと延在する張出材１２とを有し、張出材１２は、新設床版３０の下面３０ｓに当接する新設床版当接面１３と、既設床版３の下面３ｓとは分離しつつ、既設床版３の下面３ｓに当接する既設床版当接面１４とを含むため、既設床版当接面１４が力点として機能し、棒材１１と張出材１２との固定部であるネジ溝１１ｓ及びナット１１ｎが支点として機能し、新設床版当接面１３が作用点として機能することにより、単純な構造で既設床版３に対する下方への荷重が新設床版３０に伝達されるようにすることができる。 Further, according to the present embodiment, the bracket 10 is fixed to the bar 11 protruding from below the new floor slab 30 and the bar 11, and from the lower surface 30s of the new floor slab 30 to the lower surface 3s of the existing floor slab 3. The overhanging material 12 is separated from the new floor slab contact surface 13 that abuts on the lower surface 30s of the new floor slab 30 and the lower surface 3s of the existing floor slab 3. Since the existing floor slab contact surface 14 that contacts the lower surface 3s of the existing floor slab 3 is included, the existing floor slab contact surface 14 functions as a force point and is a fixing portion between the bar 11 and the overhanging material 12. The screw groove 11s and the nut 11n function as fulcrums, and the new floor slab contact surface 13 functions as an action point, so that a downward load on the existing floor slab 3 is transmitted to the new floor slab 30 with a simple structure. Can be done.

また、本実施形態によれば、新設床版３０は、繊維補強コンクリート製プレキャスト床版、鋼床版及びワッフル型繊維補強コンクリート製プレキャスト床版３１ａ，３１ｂのいずれかであるため、新設床版３０の厚さを薄くし易く、新設床版３０の重量を軽くし易い。 Further, according to the present embodiment, since the new floor slab 30 is any one of a fiber reinforced concrete precast plate bridge, a steel plate bridge and a waffle type fiber reinforced concrete precast plate bridge 31a and 31b, the new floor slab 30 It is easy to reduce the thickness of the new floor slab 30 and to reduce the weight of the new floor slab 30.

また、本実施形態によれば、新設床版設置工程では、新設床版設置工程で設置した１枚のワッフル型繊維補強コンクリート製プレキャスト床版３１ｂに隣接してもう１枚のワッフル型繊維補強コンクリート製プレキャスト床版３１ｂを設置し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ｂの互いに隣接する凸部３２のそれぞれにボルト３６を挿通し、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ｂの隙間に硬化材３７を注入することにより、互いに隣接するワッフル型繊維補強コンクリート製プレキャスト床版３１ｂのそれぞれを一体化させるため、新設床版３０同士の接合を迅速に行うことができる。 Further, according to the present embodiment, in the new floor slab installation process, another waffle type fiber reinforced concrete adjacent to one waffle type fiber reinforced concrete precast floor slab 31b installed in the new floor slab installation process. Precast floor slabs made of waffle-type fiber reinforced concrete 31b are installed, and bolts 36 are inserted into each of the convex portions 32 adjacent to each other of the precast floor slabs made of waffle-type fiber reinforced concrete 31b adjacent to each other. By injecting the hardening material 37 into the gap of 31b, each of the waffle-type fiber reinforced concrete precast floor slabs 31b adjacent to each other is integrated, so that the new floor slabs 30 can be joined quickly.

また、本実施形態によれば、既設床版撤去工程では、橋桁２の上に架設された既設床版３を橋軸直角方向Ｙに作業帯７と車両Ｖが通行可能な通行帯８とに分割し、作業帯７の既設床版３の一部を撤去し、新設床版設置工程では、既設床版撤去工程で既設床版３を撤去された作業帯７に残存する既設床版３に隣接して新たに新設床版３０を設置するため、既設床版撤去工程や新設床版設置工程が行われない通行帯８では車両Ｖを通行させることができ、交通量の低下を抑制することができる。 Further, according to the present embodiment, in the existing floor slab removal step, the existing floor slab 3 erected on the bridge girder 2 is divided into a work zone 7 and a passage zone 8 through which the vehicle V can pass in the direction Y perpendicular to the bridge axis. It is divided and a part of the existing floor slab 3 of the work zone 7 is removed, and in the new floor slab installation process, the existing floor slab 3 is replaced with the existing floor slab 3 remaining in the work zone 7 from which the existing floor slab 3 was removed in the existing floor slab removal process. Since the new floor slab 30 is newly installed adjacent to it, the vehicle V can pass through the lane 8 where the existing floor slab removal process and the new floor slab installation process are not performed, and the decrease in traffic volume can be suppressed. Can be done.

以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく様々な形態で実施される。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and is implemented in various forms.

１…橋梁、２…橋桁、３…既設床版、３ｓ…下面、４，５…壁高欄、６…仮防護柵、７…作業帯、８…通行帯、９…補強ケーブル、１０…ブラケット、１１…棒材、１１ｓ…ネジ溝、１１ｎ…ナット、１２…張出材、１２ｒ…リブ、１２ｈ…孔部、１３…新設床版当接面、１４…既設床版当接面、１５…支持高度変更機構、１６…新設床版側部材、１６ｒ…リブ、１６ｇ…ゴム板、１７…既設床版側部材、１７ｒ…リブ、１７ｇ…ゴム板、２１…ウェブ、２２…横リブ、２３…接続板、３０…新設床版、３０ｓ…下面、３０ｎ…ナット、３１ａ，３１ｂ…ワッフル型繊維補強コンクリート製プレキャスト床版、３２…凸部、３３…凹部、３４，３５…せん断キー、３６…ボルト、３６ｎ…ナット、３７…硬化材、４０，５０…壁高欄、６０…支持材、１００…補強構造、Ｘ…橋軸方向、Ｙ…橋軸直角方向、Ｖ…車両。 1 ... Bridge, 2 ... Bridge girder, 3 ... Existing floor slab, 3s ... Bottom surface, 4, 5 ... Wall balustrade, 6 ... Temporary guard fence, 7 ... Work zone, 8 ... Passage zone, 9 ... Reinforcing cable, 10 ... Bracket, 11 ... Bar material, 11s ... Screw groove, 11n ... Nut, 12 ... Overhang material, 12r ... Rib, 12h ... Hole, 13 ... New floor slab contact surface, 14 ... Existing floor slab contact surface, 15 ... Support Altitude change mechanism, 16 ... new floor slab side member, 16r ... rib, 16g ... rubber plate, 17 ... existing floor slab side member, 17r ... rib, 17g ... rubber plate, 21 ... web, 22 ... horizontal rib, 23 ... connection Plate, 30 ... New floor slab, 30s ... Bottom surface, 30n ... Nut, 31a, 31b ... Waffle type fiber reinforced concrete precast floor slab, 32 ... Convex, 33 ... Concave, 34, 35 ... Shear key, 36 ... Bolt, 36n ... nut, 37 ... hardened material, 40, 50 ... wall balustrade, 60 ... support material, 100 ... reinforcing structure, X ... bridge axis direction, Y ... bridge axis perpendicular direction, V ... vehicle.

Claims (10)

橋桁の上に架設された既設床版の一部を撤去し、前記橋桁の上に残存する前記既設床版に隣接して新たに新設床版を設置する床版入替時の補強構造であって、
前記橋桁の上に残存する前記既設床版に隣接して新たに設置された前記新設床版から前記既設床版の下面へと延在し、前記既設床版の下面とは分離しつつ、前記既設床版の下面を支持することにより、前記既設床版に対する下方への荷重を前記新設床版に支持させるブラケットを備えた床版入替時の補強構造。 It is a reinforcement structure at the time of replacement of the floor slab, in which a part of the existing floor slab erected on the bridge girder is removed and a new floor slab is newly installed adjacent to the existing floor slab remaining on the bridge girder. ,
The new floor slab newly installed adjacent to the existing floor slab remaining on the bridge girder extends to the lower surface of the existing floor slab, and while being separated from the lower surface of the existing floor slab, the said A reinforcing structure at the time of replacement of the floor slab, which is provided with a bracket that supports the lower surface of the existing floor slab to support the downward load on the existing floor slab to the new floor slab. 前記ブラケットは、前記既設床版の下面を支持する高さを変更可能な支持高度変更機構を有する、請求項１に記載の床版入替時の補強構造。 The reinforcing structure for replacing a floor slab according to claim 1, wherein the bracket has a support height changing mechanism capable of changing the height of supporting the lower surface of the existing floor slab. 前記ブラケットは、
前記新設床版の下方から突出した棒材と、
前記棒材に固定され、前記新設床版の下面から前記既設床版の下面へと延在する張出材と、
を有し、
前記張出材は、
前記新設床版の下面に当接する新設床版当接面と、
前記既設床版の下面とは分離しつつ、前記既設床版の下面に当接する既設床版当接面と、
を含む、請求項１又は２に記載の床版入替時の補強構造。 The bracket
A bar protruding from below the new floor slab and
An overhanging material fixed to the bar and extending from the lower surface of the new floor slab to the lower surface of the existing floor slab.
Have,
The overhanging material is
The new floor slab contact surface that contacts the lower surface of the new floor slab,
An existing floor slab contact surface that abuts on the lower surface of the existing floor slab while being separated from the lower surface of the existing floor slab.
The reinforcing structure at the time of replacement of the floor slab according to claim 1 or 2, including the above. 前記新設床版は、繊維補強コンクリート製プレキャスト床版、鋼床版、及び前記新設床版の下面に格子状の凸部によりその周囲を区画された複数の凹部を有するワッフル型繊維補強コンクリート製プレキャスト床版のいずれかである、請求項１〜３のいずれか１項に記載の床版入替時の補強構造。 The new floor slab is a waffle-type fiber reinforced concrete precast having a fiber reinforced concrete precast floor slab, a steel plate bridge, and a plurality of recesses on the lower surface of the new floor slab having a grid-like convex portion. The reinforcing structure at the time of replacement of the floor slab according to any one of claims 1 to 3, which is one of the floor slabs. 橋桁の上に架設された既設床版の一部を撤去する既設床版撤去工程と、
前記既設床版撤去工程の後に前記橋桁の上に残存する前記既設床版に隣接して新たに新設床版を設置する新設床版設置工程と、
前記新設床版設置工程で前記橋桁の上に残存する前記既設床版に隣接して新たに設置された前記新設床版から前記既設床版の下面へと延在し、前記既設床版の下面とは分離しつつ、前記既設床版の下面を支持するブラケットにより、前記既設床版に対する下方への荷重を前記新設床版に支持させる補強工程と、
を備えた床版入替方法。 The existing floor slab removal process to remove a part of the existing floor slab erected on the bridge girder, and
A new floor slab installation process in which a new floor slab is newly installed adjacent to the existing floor slab remaining on the bridge girder after the existing floor slab removal step.
The new floor slab newly installed adjacent to the existing floor slab remaining on the bridge girder in the new floor slab installation process extends to the lower surface of the existing floor slab and extends from the lower surface of the existing floor slab. A reinforcement step in which the new floor slab supports a downward load on the existing floor slab by a bracket that supports the lower surface of the existing floor slab while being separated from the above.
How to replace the floor slab with. 前記補強工程では、前記既設床版の下面を支持する高さを変更可能な支持高度変更機構を有する前記ブラケットにより、前記既設床版に対する下方への荷重を前記新設床版に支持させる、請求項５に記載の床版入替方法。 In the reinforcing step, the new floor slab is made to support a downward load on the existing floor slab by the bracket having a support altitude changing mechanism capable of changing the height of supporting the lower surface of the existing floor slab. The floor slab replacement method according to 5. 前記補強工程では、
前記新設床版の下方から突出した棒材と、
前記棒材に固定され、前記新設床版の下面から前記既設床版の下面へと延在する張出材と、
を有し、
前記張出材は、
前記新設床版の下面に当接する新設床版当接面と、
前記既設床版の下面とは分離しつつ、前記既設床版の下面に当接する既設床版当接面と、
を含む前記ブラケットにより、前記既設床版に対する下方への荷重を前記新設床版に支持させる、請求項５又は６に記載の床版入替方法。 In the reinforcement step,
The bar material protruding from the bottom of the new floor slab and
An overhanging material fixed to the bar and extending from the lower surface of the new floor slab to the lower surface of the existing floor slab.
Have,
The overhanging material is
The new floor slab contact surface that contacts the lower surface of the new floor slab,
An existing floor slab contact surface that abuts on the lower surface of the existing floor slab while being separated from the lower surface of the existing floor slab.
The floor slab replacement method according to claim 5 or 6, wherein a downward load on the existing floor slab is supported by the new floor slab by the bracket including the above. 前記新設床版設置工程では、繊維補強コンクリート製プレキャスト床版、鋼床版、及び前記新設床版の下面に格子状の凸部によりその周囲を区画された複数の凹部を有するワッフル型繊維補強コンクリート製プレキャスト床版のいずれかの前記新設床版を設置する、請求項５〜７のいずれか１項に記載の床版入替方法。 In the new floor slab installation process, a waffle-type fiber reinforced concrete having a precast slab made of fiber reinforced concrete, a steel slab, and a plurality of recesses on the lower surface of the new floor slab, the periphery of which is partitioned by a grid-like convex portion. The floor slab replacement method according to any one of claims 5 to 7, wherein the new floor slab of any of the precast floor slabs manufactured by the manufacturer is installed. 前記新設床版設置工程では、
前記新設床版設置工程で設置した１枚の前記ワッフル型繊維補強コンクリート製プレキャスト床版に隣接してもう１枚の前記ワッフル型繊維補強コンクリート製プレキャスト床版を設置し、
互いに隣接する前記ワッフル型繊維補強コンクリート製プレキャスト床版の互いに隣接する前記凸部のそれぞれにボルトを挿通し、互いに隣接する前記ワッフル型繊維補強コンクリート製プレキャスト床版の隙間に硬化材を注入することにより、互いに隣接する前記ワッフル型繊維補強コンクリート製プレキャスト床版のそれぞれを一体化させる、請求項８に記載の床版入替方法。 In the new floor slab installation process,
Another waffle-type fiber-reinforced concrete precast floor slab was installed adjacent to the one waffle-type fiber-reinforced concrete precast floor slab installed in the new floor slab installation process.
Inserting bolts into each of the convex portions of the waffle-type fiber reinforced concrete precast slab adjacent to each other, and injecting a hardening material into the gaps of the waffle-type fiber reinforced concrete precast slab adjacent to each other. The floor slab replacement method according to claim 8, wherein each of the waffle-type fiber reinforced concrete precast floor slabs adjacent to each other is integrated with each other. 前記既設床版撤去工程では、橋桁の上に架設された既設床版を橋軸直角方向に作業帯と車両が通行可能な通行帯とに分割し、前記作業帯の前記既設床版の一部を撤去し、
前記新設床版設置工程では、前記既設床版撤去工程で前記既設床版を撤去された前記作業帯に残存する前記既設床版に隣接して新たに新設床版を設置する、請求項５〜９のいずれか１項に記載の床版入替方法。 In the existing floor slab removal step, the existing floor slab erected on the bridge girder is divided into a work zone and a passage zone through which vehicles can pass in the direction perpendicular to the bridge axis, and a part of the existing floor slab of the work zone. Removed,
In the new floor slab installation step, a new floor slab is newly installed adjacent to the existing floor slab remaining in the work zone from which the existing floor slab was removed in the existing floor slab removal step. The floor slab replacement method according to any one of 9.
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JPH082164Y2 (en) * 1991-12-26 1996-01-24 日本サミコン株式会社 Bridge slab repair structure
US5311629A (en) * 1992-08-03 1994-05-17 Smith Peter J Deck replacement system with improved haunch lock
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