新型多节扩孔土钉护坡加固施工技术研究与应用

Research and Application of New Multi Section Reaming Soil Nail Slope Protection Construction Technology

土钉墙因简易的施工工艺及良好的经济性,在基坑边坡加固工程中得到了广泛应用。随着工程技术的发展,国内外工程技术人员针对土钉结构、水泥注浆体、坡面连接方式等进行了一系列的研究和改进,并取得了不少成果。在北京市五环路—上清桥疏堵改造工程中对土钉加固技术进行改进,减少了土钉长度,提高施工便捷性且环境保护效果良好。结合对新型多节扩孔土钉加固施工工艺的介绍,针对改进的土钉进行了受力性能等方面分析,总结其中关键技术。

Soil nailing wall has been widely used in foundation excavation slope reinforcement project because of its simple construction technology and good economic efficiency.With the development of engineering technology,engineers and technicians from home and abroad have carried out a series of research to improve the soil nailing structure,cement grouting body and slope connection mode,and have achieved a lot of results.The soil nailing reinforcement technology was improved in the reconstruction project of the Fifth Ring Road-Shangqing Bridge in Beijing,which reduced the length of soil nailing,improved the convenience of construction and had a good effect on environmental protection.Combined with the introduction of the construction technology of the new multi-section reaming soil nailing reinforcement,the mechanical performance of the improved soil nailing is analyzed,and the key technologies are summarized.