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为了研究使用预应力碳纤维板加固狮子古河大桥,通过分析加固面混凝土处理、植入锚栓、安装固定端锚具与张拉端锚具、张拉碳纤维板及固化养护与防护处理等施工过程,提出适合狮子古河大桥空心板加固技术。结果表明:施工前应保证碳纤维板粘贴部位混凝土表层含水率≤4%、温度≥5℃;粘贴部位的混凝土表面坚实,打磨至集料新面,且平整度应达到2mm/5m;碳纤维板粘贴表面采用粗砂布进行糙化处理,并且使用无水乙醇擦拭干净;预应力碳纤维板张拉过程,采用延伸量与张拉应力双控制,以张拉应力控制为主;预应力破纤维板施工完成后,采用防火砂浆进行表面涂装防护。监测显示,狮子古河大桥预应力碳纤维板加固系统的预应力未产生明显变化、碳纤维板与空心板底表面粘结良好、未受到疲劳荷载及环境作用的显著影响,桥梁承载能力得到提高,满足承载力及变形要求,分析结果表明达到了加固设计的目的。
In order to study the reinforcement of Lions Furukawa Bridge by using prestressed carbon fiber reinforced plastic (CFRP) slabs, the construction process of concrete reinforcement in anchorage surface, anchorage of anchorage, anchorage of anchorage end and tension anchorage, tensioning of carbon fiber reinforced board and cured curing and protection are analyzed. Proposed for the lion ancient river hollow slab reinforcement technology. The results show that the moisture content of concrete surface should be less than or equal to 4% and the temperature should be more than or equal to 5 ℃ before the construction. The surface of the concrete should be solidified and ground to the new surface of aggregate, and the flatness should reach 2mm / 5m. The surface is roughened with grit cloth and wiped clean with absolute ethyl alcohol. The process of prestressing carbon fiber board is controlled by the double control of the amount of extension and the tension stress, and the stress is mainly controlled by the tension stress. After the construction of prestressed fiberboard is completed , The use of fire-resistant mortar surface coating protection. Monitoring shows that the prestressed carbon fiber reinforced plastic reinforcement system of the ancient bridge had no significant changes in prestressed carbon fiber board and the bottom surface of the hollow board bonding well without fatigue load and environmental effects significantly affected the carrying capacity of the bridge has been increased to meet the bearing Force and deformation requirements, the analysis results show that the purpose of strengthening the design.