摘要
针对装配式桥梁预制件的预埋钢绞线吊环受力性能展开试验研究。考虑吊环形状、埋置深度、是否设置P锚等参数,共设计制作了6个不同的钢绞线吊环,通过拔出试验对钢绞线吊环的力学性能进行了测试。试验结果表明,钢绞线与混凝土黏结强度较低,很难充分发挥其抗拉强度;在钢绞线埋置端设置P锚和锚固钢板,可大幅提高其承载力并减小埋置深度。此外,对某高速公路130 t预制桥墩在原位竖直起吊、放倒和扶直等过程中钢绞线吊环的应变进行测试,验证了预埋钢绞线吊环的安全性,指出了钢绞线吊环受力的不均性特性,并对实际工程吊环设计提出优化建议。
The experimental study on the mechanical properties of embedded steel strand hanger is carried out for the fabricated bridge members.By considering the parameters of hanger shape,embedding depth and whether or not to set P anchor,there are six different steel strand hangers to be designed and manufactured.The mechanical properties of steel strand hanger are tested by the pull-out tests.The test result shows that the bond strength between concrete and steel strand is lower,and its tensile strength is hard to play the role.The P-shape anchor set at the embedding end of steel strand to anchor the steel plate can greatly improve its bearing capacity and decrease the embedment depth.In addition,the strain of steel strand hangers for vertical hoisting,laying down and straightening a 130 t precast bridge pier in situ of expressway is tested to verify the safety of embedded steel strand hangers.The uneven mechanical properties of steel strand hanger are pointed out,and the optimization suggestions for the design of practical engineering hanger are put forward.
作者
刘佳
李承志
白植鹏
杨陈伟
赵俊亮
LIU Jia;LI Chengzhi;BAI Zhipeng;YANG Chenwei;ZHAO Junliang
出处
《城市道桥与防洪》
2024年第5期244-247,M0021,共5页
Urban Roads Bridges & Flood Control
基金
温州市科技局基础性工业科技项目(G20210026)
浙江省自然科学基金探索项目(LY21E080003)。
关键词
钢绞线吊环
吊点
拉拔
桥梁预制件
吊装
steel strand hanger
hoisting point
pull-out
precast bridge members
hoisting
