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北京地铁西单车站开挖跨度26.14m,覆盖层仅6m,土层自稳能力极差,采用浅埋暗挖法施工,研究并应用了大管棚超前支护技术,确保安全施工。本文较详细地介绍大管棚超前支护技术的试验研究成果、施钻工艺和质量控制措施。
Beijing Xidan Station has an excavation span of 26.14m and the cover is only 6m. The soil self-stability is extremely poor. The shallow tunneling method is used for construction. The advanced support technology for large pipe sheds is studied and applied to ensure safe construction. This article describes in more detail the test results of advanced support technology for large pipe sheds, drilling technology and quality control measures.