大管棚施工工艺_.doc

大管棚施工工艺_ ，隧道大管棚施工工艺。
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隧道浅埋岩堆体 ?108大管棚超前支护施工工艺 　　　　　编制: 　　　　　 　　　　　审核: 彭酉项目经理部 二00三年十一月三十日 　　目录 　　 1.前言·····································2 2.工程概况·································2 　2.1概述··································2 2.2大管棚变更情况························3 2.3大管棚超前支护方法····················4 3.施工工艺·································7 3.1测量放样······························7 　　　3.2钻孔··································9 3.3配管·································11 　　　3.4送管·································12 　　　3.5下钢筋笼·····························13 　　　3.6管口封闭·····························13 　　　3.7注浆·································13 　3.8沉降观测·····························18 3.9事故预防和处理·······················18 3.10机具设备和劳力······················19 4.安全措施································20 5.结论····································21 6.相关知识点······························21 7.主要参考目····························24 　　1.前言 　　重庆市彭（水）酉（阳）二级公路A标段下南城隧道全长772m(K2+423~K3+195)，但其进口处于破碎土岩堆地段长达182m(K2+423~K2+605),且最浅埋深仅2m,同时围岩含水量大，工程力学性质差，开挖后易坍塌，成洞困难。
　　为确保开挖稳定，进口K2+433~K2+488段55m，隧道拱部120°范围采用?108×8mm超前大管棚注浆支护辅助施工，共设两环，每环钢管总长度30m。
　　我公司施工类似大直径的长大管棚，并且达到两环以上（包括两环），这是
第一次。
其施工工艺和方法尚无成熟的经验可以借鉴，需要进行摸索和研究。
因此有必要对?108大管棚超前支护的施工方法、适用机械、劳动组织等进行研究和总结，以便更好地加以推广和应用。
　　将?108大管棚超前支护的施工工艺，形成一整套操作性强、系统完整、详实准确、技术含量高、有推广价值的成果。
对于提高工程的科技含量，增强技术创新能力，全面贯彻"科技是
第一生产力