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纤维增强聚合物(FRP)筋耐腐蚀,抗拉强度高,弹性模量小,用于边坡加固锚杆结构是解决钢筋锚杆结构耐久性问题的途径之一,预应力FRP锚杆结构是合理型式。FRP筋抗剪强度低,钢筋锚杆施加预应力采用的刚性夹具不能用于FRP锚杆。基于端部封闭的钢套管充填膨胀剂锚固FRP筋法,设计了FRP锚杆预应力施加及锚索装置,并进行了现场试验。试验结果表明:预应力锁定装置的原理可行,结构合理,使用方便,能较好地完成玄武–玻璃纤维增强聚合物(B-GFRP)锚杆的预应力施加和锁定,经历外部环境变化检验,降雨、震动等环境影响产生的预应力损失均缘于杆体界面的黏结蜕化,没有发生锁定装置失效导致荷载明显损失的现象。B-GFRP锚杆的预应力损失百分率在5%~35%间,达到了精轧螺纹钢锚杆预应力损失的控制标准。
Fiber reinforced polymer (FRP) tendons are corrosion-resistant, with high tensile strength and low modulus of elasticity. One of the ways to solve the problem of durability of reinforced rock bolt structures is to reinforce the anchor bolt structure. The prestressed FRP anchor structure is Reasonable type. FRP bars have low shear strength and rigid clamps used for prestressing reinforcement bars can not be used for FRP anchors. Based on FRP tendon method, the FRP tendons were filled with expansive agent and the prestressed force was applied to FRP anchor rod. An on-site test was carried out. The experimental results show that the principle of prestressed locking device is feasible, reasonable structure and easy to use, which can well pre-stress and lock the basalt-glass fiber reinforced polymer (B-GFRP) Prestress loss caused by environmental impact such as rainfall and vibration is due to the degeneration of the bond at the rod interface, and no obvious load loss occurs due to the failure of the locking device. The percentage of prestress loss of B-GFRP anchors is between 5% and 35%, which reaches the control standard of the prestress loss of the finished bolt rebar.