涨壳式中空注浆锚杆标准化施工关键参数试验研究  

Experimental Study on Key Parameters of Standardized Construction of Inflatable Ground Anchor with Hollow Bar Grouting

作　　者：谢壁婷 XIE Biting(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063;National&.Local Joint Engineering Research Center for Underwater Tunneling Technology,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]水下隧道技术国家地方联合工程研究中心,武汉430063

出　　处：《土工基础》2024年第2期361-364,共4页Soil Engineering and Foundation

摘　　要：为满足隧道标准化建造要求,须对隧道建造过程中主要工序措施的技术参数和施工质量进行管控和评价。通过现场测试、室内试验等手段对不同地层的锚固力、预应力施加扭矩转换关系、锚杆止浆关键参数等进行了研究,提出了低预应力涨壳式中空注浆锚杆的标准化施工工艺和关键技术参数。结果表明:不同岩性的锚杆涨壳头锚固力差别较大,岩性较差的地层如炭质页岩段则不建议选用涨壳式中空注浆锚杆;施加的锚杆预应力应不小于60 kN,建议扭矩值不低于600 N·m,要保证施工质量须安装质量可控的专用工装设备;锚杆应配置具有排气稳压功能的止浆塞,以实现注浆压力不小于0.5 MPa,稳压时间不小于30 s的要求。To meet the requirements of the standardized tunnel construction,it is necessary to control and to evaluate the tech-nical parameters and construction quality of the main process measures during the tunnel construction process.Throughout the on-site and laboratory testing,the key parameters in the grouting of the ground anchors with hollow bars,such as,the ancho-ring loads,pre-stressed torque conversion relationship,and grout stopping are studied.The standardized construction technolo-gy and the key technical parameters of the low pre-stressed inflatable ground anchor with hollow bars are proposed.The results show that,there is a significant difference in the anchoring load of the inflatable head of the ground anchors in different soil and rock strata.For layers with poor geotechnical properties,such as the carbonaceous shale section,it is not recommended to use the inflatable ground anchor with hollow bars.The prestressing load applied to the anchor rod should not be less than 60kN,and it is recommended that the torque value should not be less than 6ooN:m.To ensure the construction quality,special tooling and equipment with good quality control measures must be installed;The ground anchor should be equipped with a grout stop plug with exhaust and pressure stabilization function to achieve the requirement of the grouting pressure not less than 0.5MPa and the pressure stabilization time not less than 30s.

关 键 词：涨壳式中空注浆锚杆 锚固力 预应力 止浆塞 标准化施工 

分 类 号：TU413[建筑科学—岩土工程]