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A platform for research: civil engineering, architecture and urbanism
Prestressed concrete cast-in-place continuous box girder bridge without downwarping and cracking and construction method
The invention discloses a non-downwarping and non-cracking prestressed concrete cast-in-place continuous box girder bridge and a construction method. The non-downwarping and non-cracking prestressed concrete cast-in-place continuous box girder bridge comprises a concrete box girder which is composed of a top plate, a web plate, a bottom plate and a flange plate, an inner cavity of the concrete box girder is of a hollow structure, internal prestressed steel beams are arranged in the top plate and the flange plate of the box girder, and external prestressed steel beams are arranged in the inner cavity of the box girder. The two ends of the external steel beam are anchored at the two ends of the concrete box girder; wherein the internal steel beams are used for bearing self-weight load of the box girder, and the external steel beams are used for bearing live load of second-stage pavement and automobiles. Reasonable design is adopted, during concrete pouring, bending deformation is avoided, only axial compression deformation exists, the total cross section of the box girder is pressed in the construction and operation process, the stress condition of the bridge in the operation stage is remarkably improved, and the problem that a common cast-in-place prestressed concrete continuous girder bridge cracks and downwarps due to shrinkage creep in the later stage is thoroughly solved.
本发明公开了一种无下挠、无开裂的预应力混凝土现浇连续箱梁桥及施工方法。本发明的无下挠、无开裂的预应力混凝土现浇连续箱梁桥，包括由顶板、腹板、底板和翼缘板组成的内腔呈空心结构的混凝土箱梁，在箱梁的顶板和翼缘板内排列设置有体内预应力钢束，箱梁内腔中设置有体外预应力钢束，钢束转换器和钢束减震器，体外钢束的两端锚固在混凝土箱梁两端；其中体内钢束用于承担箱梁自重荷载，体外钢束用于承担二期铺装及汽车活荷载。本发明采用合理的设计，在混凝土浇注时，没有弯曲变形只有轴向压缩变形，施工和运营过程箱梁全截面受压，显著改善了桥梁运营阶段的受力状况，彻底解决了普通现浇预应力混凝土连续梁桥后期因收缩徐变而开裂下挠的病害。
Prestressed concrete cast-in-place continuous box girder bridge without downwarping and cracking and construction method
The invention discloses a non-downwarping and non-cracking prestressed concrete cast-in-place continuous box girder bridge and a construction method. The non-downwarping and non-cracking prestressed concrete cast-in-place continuous box girder bridge comprises a concrete box girder which is composed of a top plate, a web plate, a bottom plate and a flange plate, an inner cavity of the concrete box girder is of a hollow structure, internal prestressed steel beams are arranged in the top plate and the flange plate of the box girder, and external prestressed steel beams are arranged in the inner cavity of the box girder. The two ends of the external steel beam are anchored at the two ends of the concrete box girder; wherein the internal steel beams are used for bearing self-weight load of the box girder, and the external steel beams are used for bearing live load of second-stage pavement and automobiles. Reasonable design is adopted, during concrete pouring, bending deformation is avoided, only axial compression deformation exists, the total cross section of the box girder is pressed in the construction and operation process, the stress condition of the bridge in the operation stage is remarkably improved, and the problem that a common cast-in-place prestressed concrete continuous girder bridge cracks and downwarps due to shrinkage creep in the later stage is thoroughly solved.
本发明公开了一种无下挠、无开裂的预应力混凝土现浇连续箱梁桥及施工方法。本发明的无下挠、无开裂的预应力混凝土现浇连续箱梁桥，包括由顶板、腹板、底板和翼缘板组成的内腔呈空心结构的混凝土箱梁，在箱梁的顶板和翼缘板内排列设置有体内预应力钢束，箱梁内腔中设置有体外预应力钢束，钢束转换器和钢束减震器，体外钢束的两端锚固在混凝土箱梁两端；其中体内钢束用于承担箱梁自重荷载，体外钢束用于承担二期铺装及汽车活荷载。本发明采用合理的设计，在混凝土浇注时，没有弯曲变形只有轴向压缩变形，施工和运营过程箱梁全截面受压，显著改善了桥梁运营阶段的受力状况，彻底解决了普通现浇预应力混凝土连续梁桥后期因收缩徐变而开裂下挠的病害。
Prestressed concrete cast-in-place continuous box girder bridge without downwarping and cracking and construction method
一种无下挠、无开裂的预应力混凝土现浇连续箱梁桥及施工方法
LI HUAQIANG (author) / SHEN CHENGYUE (author) / YANG JUNFENG (author) / ZHANG YU (author) / XIE LIWEI (author) / FENG XIAOQING (author) / LI JUNLIANG (author) / SHI PENG (author) / YANG KE (author) / REN YUNYANG (author)
2023-07-04
Patent
Electronic Resource
Chinese
IPC:
E01D
BRIDGES
,
Brücken
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