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隧道浅埋岩堆体108ø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 录下载后可任意编辑1.前言·····································22.工程概况·································22.1概述··································22.2大管棚变更情况························32.3大管棚超前支护方法····················43.施工工艺·································73.1测量放样······························73.2钻孔························1下载后可任意编辑··········93.3配管·································113.4送管·································123.5下钢筋笼·····························133.6管口封闭·····························133.7注浆·································133.8沉降观测·····························183.9事故预防和处理·······················182下载后可任意编辑3.10机具设备和劳力······················194.安全措施································205.结论····································216.相关知识点······························217.主要参考书目····························241.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)，但其进口处于破裂土岩堆地段长达 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 55 m，隧道拱部 120°范围采纳 ø108×8mm 超前大管棚注浆支护辅助施3下载后可任意编辑工，共设两环，每环钢管总长度 30m。我公司施工类似大直径的长...