REPAIR METHOD FOR CONCRETE SLAB

To provide a repair method for a concrete slab which removes a part thereof and forms a new concrete slab so as to be continuous with the existing part, making it possible to introduce prestress effectively to a new concrete slab.SOLUTION: A repair method for a concrete slab comprises the steps of:...

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Bibliographic Details
Main Authors ANDO NAOFUMI, SHIMIZU KOICHIRO, FUJIWARA YASUHISA, NISHIMURA KAZUHIRO
Format Patent
LanguageEnglish
Japanese
Published 17.12.2020
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Summary:To provide a repair method for a concrete slab which removes a part thereof and forms a new concrete slab so as to be continuous with the existing part, making it possible to introduce prestress effectively to a new concrete slab.SOLUTION: A repair method for a concrete slab comprises the steps of: removing a damaged part of a concrete slab 11; providing a gap between remaining parts 11a and 11b on both sides on a bridge girder 1 of the part where the concrete slab has been removed so as to install a new concrete slab 21 in a state that allows relative displacement with respect to the bridge girder; introducing prestress into a new concrete slab by tension force of a new tension material 22 placed along an axial direction of the bridge girder; filling the gap between the new concrete slab and the remaining parts 11a and 11b of the concrete slab with concrete 26 or mortar; and hardening the concrete or mortar, followed by releasing the tension of the tension material 22 in which prestress is introduced into a new concrete slab.SELECTED DRAWING: Figure 5 【課題】一部を撤去し、既存部分と連続するように新たなコンクリート版を形成するコンクリート床版の補修方法において、新たなコンクリート版に有効にプレストレスを導入する。【解決手段】コンクリート床版11に損傷が生じた部分を撤去する工程と、コンクリート床版を撤去した部分の橋桁1上に、両側の残存させる部分11a,11bとの間に空隙を設け、前記橋桁との相対的な変位を許容する状態で新たなコンクリート版21を設置する工程と、新たなコンクリート版に、橋桁の軸線方向に配置した新たな緊張材22の緊張力によってプレストレスを導入する工程と、新たなコンクリート版とコンクリート床版の残存させる部分11a,11bとの間の空隙にコンクリート26又はモルタルを充填する工程と、コンクリート又はモルタルの硬化後、新たなコンクリート版にプレストレスを導入した緊張材22の緊張力を解放する工程と、を含むものとする。【選択図】図5
Bibliography:Application Number: JP20190110194