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A platform for research: civil engineering, architecture and urbanism
Concrete crack control method under action of temperature stress of super-long structure
The invention discloses a method for controlling concrete cracks under the action of temperature stress of an ultra-long structure, which comprises the following steps of: in the pouring process of a floor slab of the ultra-long structure, arranging post-pouring seams in the floor slab every 30-40m, installing middle-section prestressed tendons in each unit plate of the floor slab, and installing spanning prestressed tendons in two adjacent unit plates at the same time, the middle parts of the spanning prestressed tendons are arranged in the post-pouring seams, and the two ends of the spanning prestressed tendons extend into the two adjacent unit plates; after the unit plates reach the design strength, the prestressed tendons in the sections are tensioned; at night or in seasons with low air temperature, micro-expansion concrete is poured into the post-pouring joints to form post-pouring belts used for sealing the floor slabs; and after the post-cast strip reaches the design strength, tensioning and spanning the prestressed tendons. The problems that expansion joints cannot be reserved in part of a main body structure of engineering construction, commercial pump concrete cannot be used, and therefore the main body structure is prone to cracking, and the risk of water leakage is high are solved.
本发明公开了一种超长结构温度应力作用下混凝土裂缝控制方法，包括：在超长结构的楼板浇筑过程中，于楼板中每隔30～40m设置一条后浇缝，于楼板的每个单元板块内安装段中预应力筋，同时于相邻的两单元板块内安装跨越预应力筋，跨越预应力筋的中部设置于后浇缝内，跨越预应力筋的两端伸至相邻的两单元板块内；在单元板块达到设计强度后，张拉段中预应力筋；在夜间或气温较低的季节，于后浇缝中浇筑微膨胀混凝土以形成用于封闭楼板的后浇带；在后浇带达到设计强度后，张拉跨越预应力筋。本发明解决了工程建设的部分主体结构无法留设伸缩缝以及使用商品泵送混凝土，进而导致主体结构易产生裂缝，渗漏水的风险较高的问题。
Concrete crack control method under action of temperature stress of super-long structure
The invention discloses a method for controlling concrete cracks under the action of temperature stress of an ultra-long structure, which comprises the following steps of: in the pouring process of a floor slab of the ultra-long structure, arranging post-pouring seams in the floor slab every 30-40m, installing middle-section prestressed tendons in each unit plate of the floor slab, and installing spanning prestressed tendons in two adjacent unit plates at the same time, the middle parts of the spanning prestressed tendons are arranged in the post-pouring seams, and the two ends of the spanning prestressed tendons extend into the two adjacent unit plates; after the unit plates reach the design strength, the prestressed tendons in the sections are tensioned; at night or in seasons with low air temperature, micro-expansion concrete is poured into the post-pouring joints to form post-pouring belts used for sealing the floor slabs; and after the post-cast strip reaches the design strength, tensioning and spanning the prestressed tendons. The problems that expansion joints cannot be reserved in part of a main body structure of engineering construction, commercial pump concrete cannot be used, and therefore the main body structure is prone to cracking, and the risk of water leakage is high are solved.
本发明公开了一种超长结构温度应力作用下混凝土裂缝控制方法，包括：在超长结构的楼板浇筑过程中，于楼板中每隔30～40m设置一条后浇缝，于楼板的每个单元板块内安装段中预应力筋，同时于相邻的两单元板块内安装跨越预应力筋，跨越预应力筋的中部设置于后浇缝内，跨越预应力筋的两端伸至相邻的两单元板块内；在单元板块达到设计强度后，张拉段中预应力筋；在夜间或气温较低的季节，于后浇缝中浇筑微膨胀混凝土以形成用于封闭楼板的后浇带；在后浇带达到设计强度后，张拉跨越预应力筋。本发明解决了工程建设的部分主体结构无法留设伸缩缝以及使用商品泵送混凝土，进而导致主体结构易产生裂缝，渗漏水的风险较高的问题。
Concrete crack control method under action of temperature stress of super-long structure
超长结构温度应力作用下混凝土裂缝控制方法
WANG JIANGYONG (author) / XU MINGBO (author) / ZHOU XIAOSA (author) / YAO WENJIE (author) / LIU GUISAN (author) / LUO XIAOFANG (author) / XIE WENQIANG (author) / HOU HAILIN (author) / ZHOU LIBO (author) / LI YONGCHAO (author)
2024-02-27
Patent
Electronic Resource
Chinese
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