西成高铁卵漂石地层全套管跟管钻进施工技术

Application of Drilling with Full Casing (Benote Method) in Cobble-Boulder Stratum in Xi’an-Chengdu High-Speed Rail

摘要:

西成高铁清江河特大桥桥梁桩为钻孔灌注桩，穿越卵漂石地层，成孔难度大，钻进困难，严重制约工期。针对该地层，采用全套管跟管钻进工法，搓管机配套旋挖钻机施工，有效地解决了卵漂石地层成桩问题。

关键词:卵漂石地层;钻孔灌注桩;全套管;搓管机;旋挖钻机;跟管钻进;清江河特大桥

Abstract:

The bridge pile is bored grouting one for Qingjianghe super large bridge of Xi’an-Chengdu high-speed rail; borehole drilling was difficult because of the cobble-boulder stratum crossing which seriously restricted the time limit for the project. In view of this circumstance, drilling with full casing and rotary drilling rig with casing oscillator were adopted to solve the difficulties of pile construction in cobble-boulder stratum.

Key words:cobble-boulder stratum; bored grouting pile; full casing(Benote method); casing oscillator; rotary drilling rig; drilling with casing; Qingjianghe super large bridge