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斜井过风积砂、含水砂层是一个长期困扰建井的难题,我矿在三条斜井的施工中,从明槽开挖(风积砂层段)开始到整个含水砂层段的顺利通过,从中探索出了一条行之有效的办法及施工工艺。在施工过程中三条斜井巷道内涌水、涌砂量大,淤积速度快,迎头及两帮压力较大,为避免出现塌帮冒顶,我们采用了“管棚、管桩法”及地面“深井井点降水法”同时施工的施工工艺。自2011年1月1日明槽施工到2011年9月30日顺利通过含水砂层,除去明槽施工春节停供商品混凝土1个月和暗槽施工准备1个月的时间,仅用7个月的时间完成了近470m含水砂层施工(不含明槽段),成功地穿过了含水砂层段,最终顺利地通过了流砂层。工程项目从安全、经济、进度、质量等方面都取得了非常好的效果,也总结了宝贵经验,现就将斜井在通过含水流砂层施工中的成功应用技术做以论述。
Inclined wind over the sand, water-bearing sand is a long-standing puzzle wells, the mine in the construction of three inclined shafts, from open trench excavation (aeolian sand section) began to the entire water-bearing sand section of the smooth Passed, from which explored an effective way and construction technology. In the process of construction, three inclined shaft tunnels have gushing water, large amount of grit and sediment, quick silting up speed and large pressure in front and two gangs. In order to avoid collapse, we adopted “pipe shed and pipe pile method” and ground “Deep Well Point Precipitation Law ” construction technology at the same time. From January 1, 2011 open slot construction to September 30, 2011 through the smooth flow of sand, remove the Ming tank construction Spring Festival stop for 1 month of concrete and dark trench construction preparation for 1 month time, only 7 The month completed the construction of nearly 470 m of water-bearing sandstone (excluding the bright channel section), successfully penetrated the section of the water-bearing sand and finally passed the quicksand layer. The project has achieved very good results in terms of safety, economy, progress and quality as well as valuable experience. Now, the successful application of inclined shafts in the construction of aqueduct will be discussed.