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MANUFACTURING METHOD OF PRESTRESSED CONCRETE GIRDER
PROBLEM TO BE SOLVED: To provide a manufacturing method of a prestressed concrete girder with a fewer restrictions concerning a work location, capable of suppressing a warp caused by prestress creep deformation as desired, and allowing a warp amount to be adjusted readily.SOLUTION: A manufacturing method of a prestressed concrete girder includes: steps (A, B) in which a concrete girder 10 is formed by casting concrete in a concrete mold 5; the step (B) in which prestress is introduced at a lower part of the concrete girder 10, by applying tensile force of a lower prestressed concrete steel 3 laid at the lower part of the concrete girder 10 at least in a central part of a span and extending in a member axis direction; a step (C) in which prestress is introduced to an upper part of the concrete girder 10, by applying tensile force of an upper prestressed concrete steel 7 laid above a neutral surface of the concrete girder 10 at least in the central part of the span and extending in the member axis direction; and the step (C) in which the prestress by the upper prestressed concrete steel 7 is retained for a prescribed period P, in accordance with a creep deformation caused by the prestress introduced at the lower part of the concrete girder 10.SELECTED DRAWING: Figure 4
【課題】作業箇所に制約が少なく、プレストレスクリープ変形による反りを所望に抑制でき、かつ反り量を容易に調整できるＰＣ桁の製造方法を提供する。【解決手段】型枠５内にコンクリートを打設してコンクリート桁１０を形成するステップ（Ａ、Ｂ）と、少なくとも径間中央部においてコンクリート桁１０の下部に配置されて部材軸方向に延在する下側ＰＣ鋼材３の緊張力を作用させてコンクリート桁１０の下部にプレストレスを導入するステップ（Ｂ）と、少なくとも径間中央部においてコンクリート桁１０の中立面よりも上方に配置されて部材軸方向に延在する上側ＰＣ鋼材７の緊張力を作用させてコンクリート桁１０の上部にプレストレスを導入するステップ（Ｃ）と、コンクリート桁１０の下部に導入したプレストレスによるクリープ変形量に応じ、所定期間Ｐにわたって上側ＰＣ鋼材７によるプレストレスを保持するステップ（Ｃ）とを含むものとする。【選択図】図４
MANUFACTURING METHOD OF PRESTRESSED CONCRETE GIRDER
PROBLEM TO BE SOLVED: To provide a manufacturing method of a prestressed concrete girder with a fewer restrictions concerning a work location, capable of suppressing a warp caused by prestress creep deformation as desired, and allowing a warp amount to be adjusted readily.SOLUTION: A manufacturing method of a prestressed concrete girder includes: steps (A, B) in which a concrete girder 10 is formed by casting concrete in a concrete mold 5; the step (B) in which prestress is introduced at a lower part of the concrete girder 10, by applying tensile force of a lower prestressed concrete steel 3 laid at the lower part of the concrete girder 10 at least in a central part of a span and extending in a member axis direction; a step (C) in which prestress is introduced to an upper part of the concrete girder 10, by applying tensile force of an upper prestressed concrete steel 7 laid above a neutral surface of the concrete girder 10 at least in the central part of the span and extending in the member axis direction; and the step (C) in which the prestress by the upper prestressed concrete steel 7 is retained for a prescribed period P, in accordance with a creep deformation caused by the prestress introduced at the lower part of the concrete girder 10.SELECTED DRAWING: Figure 4
【課題】作業箇所に制約が少なく、プレストレスクリープ変形による反りを所望に抑制でき、かつ反り量を容易に調整できるＰＣ桁の製造方法を提供する。【解決手段】型枠５内にコンクリートを打設してコンクリート桁１０を形成するステップ（Ａ、Ｂ）と、少なくとも径間中央部においてコンクリート桁１０の下部に配置されて部材軸方向に延在する下側ＰＣ鋼材３の緊張力を作用させてコンクリート桁１０の下部にプレストレスを導入するステップ（Ｂ）と、少なくとも径間中央部においてコンクリート桁１０の中立面よりも上方に配置されて部材軸方向に延在する上側ＰＣ鋼材７の緊張力を作用させてコンクリート桁１０の上部にプレストレスを導入するステップ（Ｃ）と、コンクリート桁１０の下部に導入したプレストレスによるクリープ変形量に応じ、所定期間Ｐにわたって上側ＰＣ鋼材７によるプレストレスを保持するステップ（Ｃ）とを含むものとする。【選択図】図４
MANUFACTURING METHOD OF PRESTRESSED CONCRETE GIRDER
ＰＣ桁の製造方法
ASAI HIROTAKA (author) / TAKENOI ISAMU (author) / HOSONO HIROMI (author) / KOIDE SATORU (author) / KANDA SHINYA (author) / NISHIHATA TOMOHIRO (author)
2016-12-15
Patent
Electronic Resource
Japanese
IPC:
E01D
BRIDGES
,
Brücken
| European Patent Office | 2021
PRESTRESSED GIRDER AND MANUFACTURING METHOD OF PRESTRESSED GIRDER
| European Patent Office | 2017
PRESTRESSED GIRDER AND MANUFACTURING METHOD OF PRESTRESSED GIRDER
European Patent Office | 2017