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针对地下工程中锚杆防腐性能存在的不足,介绍了多重防腐锚杆的构造和防腐机制。通过模拟不同的腐蚀环境,进行双重和多重防腐锚杆的抗腐蚀性试验研究,观察腐蚀后锚杆的表观变化并测试其抗拔力,分析比较两者锚筋与水泥砂浆之间的粘结强度与滑移位移的关系。分析结果表明:多重防腐锚杆由于在水泥浆中设置了套管,在不同腐蚀环境中其拉拔力始终高于双重防腐锚杆,且随时间更加明显;硫酸盐的结晶作用和腐蚀因子间的牵制效应会使防腐锚杆拉拔力有短暂的提高;多重防腐锚杆产生相同滑移位移对应的粘结强度更大,粘结强度超过极值后的残余强度高于双重防腐锚杆。以上成果能够用于地下结构中防腐锚杆的设计和后期服役期间的耐久性分析,为实际工程中防腐锚杆的抗腐蚀性能研究提供了宝贵的基础资料。
Aiming at the shortcomings of the corrosion resistance of the anchor in underground engineering, the construction and corrosion prevention mechanism of the multi-corrosion anchor are introduced. By simulating different corrosive environments, the corrosion resistance of double and multiple anticorrosive anchors was studied, the apparent changes of anchors after corrosion were observed, and their pull-out resistances were tested. The viscosities between anchor bars and cement mortar Relationship between knot strength and slip displacement. The analysis results show that the multi-anti-corrosion anchor has higher casing pull-out force than double anti-corrosion anchor rod in different corrosive environments due to the casing set in the slurry, and it is more obvious with time. Between the crystallization of sulfate and the corrosion factor The restraining effect of anchor would increase the pulling force of anti-corrosion anchor for a short time. The same anti-corrosion anchor would produce the same bond strength and the residual strength of the anti-corrosion anchor would be higher than the double anti-corrosion anchor. The above results can be used for the design of anti-corrosion anchor in underground structures and the durability analysis during the later period of service, which provide valuable basic data for the study of corrosion resistance of anti-corrosion anchor in practical projects.