青藏铁路多年冻土区桥梁钻孔灌注桩设计与施工

The Design and Construction of Bridge Bored Pile in the Over-frost Areas along the Qinghai-Tibet Railway

根据青藏铁路多年冻土的特点,着重阐述了多年冻土区桥梁钻孔灌注桩基础设计的主要原则和采取的防冻胀措施,并结合工程施工实践,提出了多年冻土区桥梁桩基采用旋挖钻机干法成孔、桩身低温早强耐久混凝土灌注施工的技术要点与难点以及相应的技术措施及施工的实际效果。

According to the over-frost features of the Qianghai-Tibet Railway, this paper emphatically expounds the main principles of the design of the bridge bored pile foundation in the over-frost areas and adopted measure for preventing the frost heave, and connecting with the construction practice, puts forward some technical points and difficult points in the pile-foundation construction and corresponding technical measures and actual results of the construction.