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介绍了在地铁明挖宽大基坑施工中采取预应力锚索支护的成功经验,通过锚索施工,起到了降低施工难度、土方开挖空间大、确保施工质量、保证基坑安全的作用。同时对预应力锚索的全套管跟进水冲法成孔、钢绞线制作与下放、锚索孔常压注浆、高压注浆,劈裂注浆、锚索张拉锁定、锚索试验等也做了较为详细的介绍。
This paper introduces the successful experience of prestressed anchor cable support in the construction of large foundation pit of open excavation of subway tunnel and plays an important role in reducing the construction difficulty, large earth excavation space, ensuring the construction quality and ensuring the safety of foundation pit through the construction of anchor cable. At the same time, the full set of prestressed anchor tubes were punched into holes for the follow-up water blasting, strand making and dropping, grouting of anchor hole at atmospheric pressure, grouting, splitting grouting, anchor tensioning, anchor cable test Also made a more detailed introduction.