A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Large-volume concrete pouring method for prestressed concrete box girder
The invention provides a large-volume concrete pouring method for a prestressed concrete box girder. The large-volume concrete pouring method comprises the following steps that a support is erected; mounting a template; installing reinforcing steel bars; prestressed tendons are installed; concrete pouring is conducted, concrete and a special tank car are adopted for transporting and pumping the concrete into the formwork for layered pouring, the pouring thickness of each layer is 45-55 cm, the vertical falling height difference of the concrete is controlled to be not larger than 2 m in the pouring process, and vibration is conducted after pouring of each layer of concrete is completed; concrete curing is conducted, specifically, after concrete pouring is completed, the surface of concrete is covered with a heat preservation and moisture preservation layer, curing is conducted for at least 12 h, and then watering curing is conducted for 14 days; in the concrete pouring process, a layered pouring method is adopted, the hydration heat peak can be reduced, and a large amount of heat can be released in the pouring process, so that the heat in the large-size concrete is reduced, the temperature difference between the inner side and the outer side of the large-size concrete after pouring is completed can be reduced, cracks caused by the too large temperature difference are avoided, and the service life of the large-size concrete is prolonged. The strength of the concrete box girder is ensured.
本发明提供一种预应力砼箱梁大体积砼浇筑方法，包括以下步骤：支架搭设；模板安装；钢筋安装；预应力筋安装；混凝土浇筑，采用混凝土，专用罐车运输并泵送至模板内部分层浇筑，每层的浇筑厚度为45～55cm，浇筑过程中控制混凝土的垂直下落高差不超过2m，每层混凝土浇筑完毕后进行振捣；混凝土养护，砼浇筑完成后，在砼表面覆盖保温及保湿层，养护至少12h，之后洒水养护14天；本发明在混凝土浇筑的过程中，采用分层浇筑的方法，能够降低水化热高峰，有利于在浇筑过程中将大量的热量释放出去，从而减少大体积砼内部的热量，进而能够减小浇筑完成后，大体积砼内外侧的温差，避免因温差过大而造成裂缝，保证砼箱梁的强度。
Large-volume concrete pouring method for prestressed concrete box girder
The invention provides a large-volume concrete pouring method for a prestressed concrete box girder. The large-volume concrete pouring method comprises the following steps that a support is erected; mounting a template; installing reinforcing steel bars; prestressed tendons are installed; concrete pouring is conducted, concrete and a special tank car are adopted for transporting and pumping the concrete into the formwork for layered pouring, the pouring thickness of each layer is 45-55 cm, the vertical falling height difference of the concrete is controlled to be not larger than 2 m in the pouring process, and vibration is conducted after pouring of each layer of concrete is completed; concrete curing is conducted, specifically, after concrete pouring is completed, the surface of concrete is covered with a heat preservation and moisture preservation layer, curing is conducted for at least 12 h, and then watering curing is conducted for 14 days; in the concrete pouring process, a layered pouring method is adopted, the hydration heat peak can be reduced, and a large amount of heat can be released in the pouring process, so that the heat in the large-size concrete is reduced, the temperature difference between the inner side and the outer side of the large-size concrete after pouring is completed can be reduced, cracks caused by the too large temperature difference are avoided, and the service life of the large-size concrete is prolonged. The strength of the concrete box girder is ensured.
本发明提供一种预应力砼箱梁大体积砼浇筑方法，包括以下步骤：支架搭设；模板安装；钢筋安装；预应力筋安装；混凝土浇筑，采用混凝土，专用罐车运输并泵送至模板内部分层浇筑，每层的浇筑厚度为45～55cm，浇筑过程中控制混凝土的垂直下落高差不超过2m，每层混凝土浇筑完毕后进行振捣；混凝土养护，砼浇筑完成后，在砼表面覆盖保温及保湿层，养护至少12h，之后洒水养护14天；本发明在混凝土浇筑的过程中，采用分层浇筑的方法，能够降低水化热高峰，有利于在浇筑过程中将大量的热量释放出去，从而减少大体积砼内部的热量，进而能够减小浇筑完成后，大体积砼内外侧的温差，避免因温差过大而造成裂缝，保证砼箱梁的强度。
Large-volume concrete pouring method for prestressed concrete box girder
一种预应力砼箱梁大体积砼浇筑方法
LI YAODONG (author) / YANG XIAOFANG (author) / CHEN HU (author) / SUN XIAOQING (author) / WANG SHUCHAO (author) / MA HAIJIAN (author) / HU TIANXIANG (author) / XU RUILONG (author) / WANG DONG (author) / BU FANYONG (author)
2022-12-13
Patent
Electronic Resource
Chinese