布曲河特大桥钻孔灌注桩施工工艺

Construction Technology of Bored Cast-in-place Pile Used for Outsize Bridge Over Buqu River

摘要:

在高原多年冻土地区，气候恶劣，生态环境脆弱，钻孔灌注桩施工中又不可避免地会遇到土层处于不同的冻结状态，施工中必须考虑并设法预防和消除由于冻土的变形、强度弱化及冻胀、融沉所引起的各种病害，因此钻孔灌注桩施工在质量、安全和环保等方面难度很大。介绍了布曲河特大桥钻孔灌注桩施工工艺，该工艺明显不同于内地通常的钻孔灌注桩施工工艺，在高原多年冻土地区是行之有效的，对高原多年冻土区钻孔灌注桩施工具有重要的参考意义。

Abstract:

In plateau ever-frozen ground region with harsh climate and vulnerable ecological environment, various conditions of frozen soil layer bring difficulties to the construction of cast-in-place pile. To be up to the related standard of qualification, safety and environment protection, kinds of calamity initiated by the distortion, intensity weakness, cold expansion and melting breakdown caused by the frozen soil must be managed to prevent and remove. Construction technology of cast-in-place pile used for Buqu River is detailed. It is obviously different from normal technology used in land but effective in plateau ever-frozen ground and it can be referred to construction in similar geological conditions.