一种旋扩工法扩大头抗浮锚杆新工艺的应用研究  

Application of a rotary expansion construction method forenlargedheadin anti-floating anchor

作　　者：曹巍 耿春雷 赵贺鹏 宋超明 张非凡 张立新 CAO Wei;GENG Chun-lei;ZHAO He-peng;SONG Chao-ming;ZHANG Fei-fan;ZHANG Li-xin(Beijing Blue Ocean Construction Co.,Ltd.,Beijing 100085,China;BCEG Civil Engineering Co.,Ltd.,Beijing 100015,China)

机构地区：[1]北京蓝海建设股份有限公司,北京100085 [2]北京建工土木工程有限公司,北京100015

出　　处：《地基处理》2024年第3期312-318,共7页Journal of Ground Improvement

摘　　要：随着城市地下空间的开发利用,地下结构抗浮问题日益严峻。阻止结构上浮的方法有多种,通过抗浮措施的对比,扩大头抗浮锚杆适用性更好、承载力更高、质量更可靠。本文结合北京某项目工程实例,通过对关键技术的改进和创新应用,研究出了一种旋扩工法扩大头抗浮锚杆新工艺,该工艺综合了机械和压浆扩孔两种方法的优点,适用于从软土到强-中风化岩层的大多数地质条件。和一般扩大头抗浮锚杆施工方法相比,可以提高锚杆成桩质量、大幅提升施工效率、降低造价。同时采用承压型变直径钢筋笼作为永久抗浮构件,使其更具有节能环保、安全耐久、便捷可控等优点。该方法在工程中的成功应用,证明了其具有较强的可行性和实用性,对同类工程施工有参考借鉴意义。With the increasing development and utilization of urban underground spaces,the challenge of preventing underground structures from floating poses a significant concern.Various methods have been proposed to address this issue.Through comparative analysis of different anti-floatingtreatments,the anti-floating anchor with enlarged head demonstrates superior applicability,higher bearing capacity and greater reliability.In this work,conducted in Beijing,a rotary expansion construction method for enlarged head in anti-floating anchors has been developed through enhancements and innovative applications of key technologies.This method combines the advantages of mechanical and grouting expansion techniques and is suitable for a wide range of geological conditions,from soft soils to highlyandmoderately weathered rock layers.Compared to conventional underreamed anchor construction methods,it enhances the quality of anchor rod pile formation,significantly improves construction efficiency,and reduces costs.Additionally,the utilization of pressure-bearing variablediameter reinforcement cages as permanent anti-floating components enhances energy efficiency,environmental sustainability,safety,durability,convenience,and controllability.The successful application of this method in practical engineering demonstrates its feasibility and practicality,offering a promising solution for similar projects in the future.

关 键 词：抗浮 扩大头抗浮锚杆 旋扩工法 可变直径钢筋笼 中心压灌混凝土 

分 类 号：TU46[建筑科学—结构工程]