弱胶结未成砂岩挑顶斜井与隧道初支结构转换技术

The Conversion Technology of Weak Cementation Sueshige Sandstone Ripping Inclined Shaft and Tunnel Initial Branch Structure

针对兰渝铁路桃树坪隧道2号斜井的弱胶结未成砂岩的地质条件,提出了一种利用挑顶斜井空间转换施工隧道初支结构的方法.通过提高斜井挑顶断面、井口钢门架、井端大拱脚、空架隧道初支、回填拱部空间等施工技术,能安全实施斜井与正洞初期支护结构受力体系的转换,保证施工安全.

According to Lan-Yu railway tunnel Taoshuping second inclined shaft weak cementation sueshige sandstone geological characteristics,describes a use of space conversion inclined shaft to tunnel initial branch structure.Construction by increasing the construction technology of inclined shaft ripping ripping,wellhead steel gantry,the large arch foot of ibata,empty frame tunnel early supported,backfill arch part space,better finished inclined shaft with initial positive supporting stress structure system conversion,to ensure construction safety.