A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PRESTRESSED STRUCTURE AND PRECAST CONCRETE MEMBER USING THE SAME
To provide a prestressed structure capable of preventing bending and cracks at an edge, and a precast concrete member using the same.SOLUTION: A precast concrete member 1 according to the present invention is a floor slab in which a pre-tensioned prestressed structure is employed, and among concrete spreading in an edge section 3a located on the right side of Fig. 1, a portion that spreads cylindrically with a material axis of a PC steel stranded wire 2 taken as the center of a cross section is constructed with ultra-high strength fiber reinforced concrete and is present as a cylindrical reaction force part 4. When tensile force introduced into the PC steel stranded wire 2 is transmitted to the concrete of the edge section 3a, the cylindrical reaction force part 4 is configured to perform tensile support for expansion force generated from the circumferential surface of the PC steel stranded wire 2 toward a direction perpendicular to the material axis, thereby generating reaction force of the expansion force toward the PC steel stranded wire 2.SELECTED DRAWING: Figure 1
【課題】 端部における曲げひび割れを防止可能なプレストレス構造及びそれを用いたプレキャストコンクリート部材を提供する。【解決手段】本発明に係るプレキャストコンクリート部材１は、プレテンション方式のプレストレス構造が採用された床版であるが、図１の右側に位置する端部区間３ａに拡がるコンクリートのうち、ＰＣ鋼より線２の材軸を横断面中心として円筒状に拡がる部分を超高強度繊維補強コンクリートで構成して円筒状反力部４としてある。円筒状反力部４は、ＰＣ鋼より線２に導入された緊張力が端部区間３ａのコンクリートに伝達されるとき、ＰＣ鋼より線２の周面からその材軸に直交する方向に向けて発生する膨張力を引張支持することで、該膨張力の反力がＰＣ鋼より線２に向けて発生するように構成してある。【選択図】 図１
PRESTRESSED STRUCTURE AND PRECAST CONCRETE MEMBER USING THE SAME
To provide a prestressed structure capable of preventing bending and cracks at an edge, and a precast concrete member using the same.SOLUTION: A precast concrete member 1 according to the present invention is a floor slab in which a pre-tensioned prestressed structure is employed, and among concrete spreading in an edge section 3a located on the right side of Fig. 1, a portion that spreads cylindrically with a material axis of a PC steel stranded wire 2 taken as the center of a cross section is constructed with ultra-high strength fiber reinforced concrete and is present as a cylindrical reaction force part 4. When tensile force introduced into the PC steel stranded wire 2 is transmitted to the concrete of the edge section 3a, the cylindrical reaction force part 4 is configured to perform tensile support for expansion force generated from the circumferential surface of the PC steel stranded wire 2 toward a direction perpendicular to the material axis, thereby generating reaction force of the expansion force toward the PC steel stranded wire 2.SELECTED DRAWING: Figure 1
【課題】 端部における曲げひび割れを防止可能なプレストレス構造及びそれを用いたプレキャストコンクリート部材を提供する。【解決手段】本発明に係るプレキャストコンクリート部材１は、プレテンション方式のプレストレス構造が採用された床版であるが、図１の右側に位置する端部区間３ａに拡がるコンクリートのうち、ＰＣ鋼より線２の材軸を横断面中心として円筒状に拡がる部分を超高強度繊維補強コンクリートで構成して円筒状反力部４としてある。円筒状反力部４は、ＰＣ鋼より線２に導入された緊張力が端部区間３ａのコンクリートに伝達されるとき、ＰＣ鋼より線２の周面からその材軸に直交する方向に向けて発生する膨張力を引張支持することで、該膨張力の反力がＰＣ鋼より線２に向けて発生するように構成してある。【選択図】 図１
PRESTRESSED STRUCTURE AND PRECAST CONCRETE MEMBER USING THE SAME
プレストレス構造及びそれを用いたプレキャストコンクリート部材
SASAKI KAZUNARI (author)
2023-11-01
Patent
Electronic Resource
Japanese
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