提高自钻式锚杆抗拔力的技术措施

Technical Measures of Improving Self-Drilling Anchor Pullout Resistance

由于受地层条件等诸因素的影响,自钻式锚杆抗拔力达不到设计要求的情况时有出现。如何提高自钻式锚杆抗拔力是采用自钻式锚杆支护时必须考虑的一个重要问题。以承德钢厂烧结机改造工程5#边坡(VK0 + 226.94-K0 + 270.64)支护为例,介绍了影响自钻式锚杆抗拔力的因素,主要从钻进成孔工艺、清孔方法、钻进技术参数选择、注浆控制等方面论述了提高自钻式锚杆抗拔力的技术措施。

Due to the influence of the geological conditions and other factors, pullout resistance of self-drilling anchor can’t achieve the design requirements appearing from time to time. How to improve the self-drilling anchor pullout resistance is an important question that must be considered in the self-drilling anchor supporting. Take Chengde Steel sintering machine renovation project of No.5 slope (VK0 + 226.94-K0 + 270.64) supporting as an example, describing the factors that affecting the self-drilling anchor pullout resistance, discussing technical measures to improve the self- drilling anchor pullout resistance mainly from drilling into the hole process, hole cleaning method, drilling technology parameter selection, grouting control and so on.