桥梁水下结构裂缝与空洞修复技术
发布时间：2018-12-21 15:34
【摘要】：由于上部荷载、水流及腐蚀环境等作用,桥梁水下混凝土结构的病害往往较为严重且难以发现。以不排水加固为指导思想,开展了水下混凝土结构病害修复技术的相关研究,通过在试验室水箱中对各类水下混凝土结构的病害进行模拟修复施工,提出水下病害修复技术工艺,主要包括水下混凝土结构裂缝修补、孔洞缺陷修复工艺。水下修复混凝土结构的力学性能对比试验表明,水下裂缝修补试件的破坏位置并不位于原结构裂缝位置,破坏属于混凝土内聚破坏,水下裂缝灌注胶对水下施工环境具有很好的适应性。经过水下混凝土孔洞修复工艺修复的缺陷试件,其抗压强度可以达到完好对比试件的强度,并超过其16.7%,修复所用的水下环氧胶强度指标远高于混凝土的强度指标,使得修复试件的强度有所提高,试件破坏时孔洞周围裂缝和破损较少,水下孔洞修复工艺对水下受损结构的加固作用较为明显。
[Abstract]:Due to the effects of upper load, water flow and corrosion environment, the disease of bridge underwater concrete structure is often serious and difficult to find. Based on the principle of undrained reinforcement, the related research on the repair technology of underwater concrete structure is carried out, and the simulated repair construction of all kinds of underwater concrete structures is carried out in the water tank of the laboratory. This paper puts forward the technology of repairing underwater disease, mainly including crack repair of underwater concrete structure and repair process of hole defect. The comparative tests of mechanical properties of underwater repaired concrete structure show that the failure position of underwater crack repair specimen is not located at the original crack position, and the damage belongs to the cohesive failure of concrete. Underwater crack grouting glue has good adaptability to underwater construction environment. The compressive strength of the defective specimen repaired by the underwater concrete hole repair process can reach the strength of the intact contrast specimen and exceed its 16.7. The strength index of the underwater epoxy adhesive used in the restoration is much higher than the strength index of the concrete. The strength of the repaired specimen is improved, the cracks and damage around the hole are less when the specimen is damaged, and the reinforcement effect of the underwater hole repair technology on the underwater damaged structure is obvious.
【作者单位】： 安徽省交通控股集团有限公司;南京林业大学土木工程学院;
【基金】：国家自然科学基金(51208262) 安徽省交通控股集团有限公司科技项目 江苏省自然科学基金(BK20151520) 江苏高校优势学科建设工程资助项目(PAPD) 江苏省“333”工程(BRA2016421) 江苏省“青蓝工程”项目
【分类号】：U445.7
本文编号：2389102
[Abstract]:Due to the effects of upper load, water flow and corrosion environment, the disease of bridge underwater concrete structure is often serious and difficult to find. Based on the principle of undrained reinforcement, the related research on the repair technology of underwater concrete structure is carried out, and the simulated repair construction of all kinds of underwater concrete structures is carried out in the water tank of the laboratory. This paper puts forward the technology of repairing underwater disease, mainly including crack repair of underwater concrete structure and repair process of hole defect. The comparative tests of mechanical properties of underwater repaired concrete structure show that the failure position of underwater crack repair specimen is not located at the original crack position, and the damage belongs to the cohesive failure of concrete. Underwater crack grouting glue has good adaptability to underwater construction environment. The compressive strength of the defective specimen repaired by the underwater concrete hole repair process can reach the strength of the intact contrast specimen and exceed its 16.7. The strength index of the underwater epoxy adhesive used in the restoration is much higher than the strength index of the concrete. The strength of the repaired specimen is improved, the cracks and damage around the hole are less when the specimen is damaged, and the reinforcement effect of the underwater hole repair technology on the underwater damaged structure is obvious.
【作者单位】： 安徽省交通控股集团有限公司;南京林业大学土木工程学院;
【基金】：国家自然科学基金(51208262) 安徽省交通控股集团有限公司科技项目 江苏省自然科学基金(BK20151520) 江苏高校优势学科建设工程资助项目(PAPD) 江苏省“333”工程(BRA2016421) 江苏省“青蓝工程”项目
【分类号】：U445.7
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1 陈楚荣;珠海对特大型桥梁进行水下结构“会诊”[N];中国水运报;2007年
，本文编号：2389102
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