A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
UHPC (Ultra High Performance Concrete) pier reinforcement process and calculation method
The invention discloses a UHPC (Ultra High Performance Concrete) bridge pier reinforcement process and a calculation method, a surrounding shear key groove is cut in an original RC bridge pier, and for a rectangular bridge pier, the shear key groove is a Z-shaped annular groove; for a circular pier, the shear key groove is a spiral groove; the surface of the original RC pier is treated through a high-pressure water flushing method, and a uniform coarse and fine aggregate contact interface is obtained; the coordinates of the formwork are determined, the surface of original concrete is coated with styrene-butadiene mortar, and the formwork is installed; a UHPC outer cladding layer is poured and vibrated to be compact; and keeping the surface wet, and performing wet curing for 7-14 days according to the thickness of the UHPC. On the basis of the existing external UHPC reinforcing thought, the interface processing mode with the shear key groove is researched and developed, the occlusal force and the annular bond stress can be effectively generated on the new interface and the old interface, and the UHPC reinforcing effect is improved. Meanwhile, according to the structure, calculation formulas of the bearing capacity of the UHPC-RC combined section bridge pier with the Z-shaped annular shear key groove and the spiral shear key groove are provided, and a practical calculation method is provided for the reinforcing technology.
本发明公开了一种UHPC桥墩加固工艺及计算方法，在原RC桥墩上切割一环绕的剪力键槽，对于矩形桥墩，剪力键槽为“Z”字环形槽；对于圆形桥墩，剪力键槽为螺旋形槽；对原RC桥墩表面用高压水冲法进行处理，获得均匀的粗细骨料接触界面；确定模板坐标，在原混凝土表面涂抹丁苯砂浆，安装模板；浇筑UHPC外包层并振捣密实；保持表面湿润，根据UHPC厚度，湿养7‑14天。本发明在已有外包UHPC加固的思路上，研发了一种带剪力键槽的界面处理方式，能在新老界面有效产生咬合力及环形握裹力，提升UHPC加固效果。同时，针对上述构造，分别提出带”Z”字环形剪力键槽和带螺旋形剪力键槽的UHPC‑RC组合截面桥墩承载能力计算公式，为加固工艺提供实用的计算方法。
UHPC (Ultra High Performance Concrete) pier reinforcement process and calculation method
The invention discloses a UHPC (Ultra High Performance Concrete) bridge pier reinforcement process and a calculation method, a surrounding shear key groove is cut in an original RC bridge pier, and for a rectangular bridge pier, the shear key groove is a Z-shaped annular groove; for a circular pier, the shear key groove is a spiral groove; the surface of the original RC pier is treated through a high-pressure water flushing method, and a uniform coarse and fine aggregate contact interface is obtained; the coordinates of the formwork are determined, the surface of original concrete is coated with styrene-butadiene mortar, and the formwork is installed; a UHPC outer cladding layer is poured and vibrated to be compact; and keeping the surface wet, and performing wet curing for 7-14 days according to the thickness of the UHPC. On the basis of the existing external UHPC reinforcing thought, the interface processing mode with the shear key groove is researched and developed, the occlusal force and the annular bond stress can be effectively generated on the new interface and the old interface, and the UHPC reinforcing effect is improved. Meanwhile, according to the structure, calculation formulas of the bearing capacity of the UHPC-RC combined section bridge pier with the Z-shaped annular shear key groove and the spiral shear key groove are provided, and a practical calculation method is provided for the reinforcing technology.
本发明公开了一种UHPC桥墩加固工艺及计算方法，在原RC桥墩上切割一环绕的剪力键槽，对于矩形桥墩，剪力键槽为“Z”字环形槽；对于圆形桥墩，剪力键槽为螺旋形槽；对原RC桥墩表面用高压水冲法进行处理，获得均匀的粗细骨料接触界面；确定模板坐标，在原混凝土表面涂抹丁苯砂浆，安装模板；浇筑UHPC外包层并振捣密实；保持表面湿润，根据UHPC厚度，湿养7‑14天。本发明在已有外包UHPC加固的思路上，研发了一种带剪力键槽的界面处理方式，能在新老界面有效产生咬合力及环形握裹力，提升UHPC加固效果。同时，针对上述构造，分别提出带”Z”字环形剪力键槽和带螺旋形剪力键槽的UHPC‑RC组合截面桥墩承载能力计算公式，为加固工艺提供实用的计算方法。
UHPC (Ultra High Performance Concrete) pier reinforcement process and calculation method
一种UHPC桥墩加固工艺及计算方法
CHEN WEIFENG (author) / ZHANG DEZHONG (author) / DENG JIE (author) / GONG YULEI (author) / HE JINLONG (author) / PENG KEKE (author)
2024-05-03
Patent
Electronic Resource
Chinese
IPC:
E01D
BRIDGES
,
Brücken
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