旋挖钻机在永宁河特大桥不同地层中的应用
  • 作者: 陈铁牛
论文摘要
[摘要] 合宁铁路永宁河1、2号特大桥钻孔灌注桩基础采用旋挖钻机施工。介绍护筒埋设、成孔等施工技术及施工控制要点。指出旋挖钻机在不同地层中的钻进措施:部分粉质粘土层中可用清水或干孔钻进,淤泥质粘土层中采用双底捞砂钻头、直接用冲击钻机钻孔弃浆,圆砾层中采用短螺旋钻头低速钻进,泥质砂岩层中采用嵌岩钻筒钻进等措施,保证施工工期满足架梁节点要求。
[关键词] 合宁铁路;桥梁;旋挖钻机;地层;施工技术

Application of Rotary Drilling Rig in Different Strata of Yongning River Bridge
Chen Tieniu

Abstract:Rotary drilling rig is used in bored pile construction of No.1 and No.2 Yongning River Bridge in Hefei-Nanjing Railway. The author introduces construction technology and control points of rotary drilling rig such as shield-tube burying and holes forming. Moreover drilling measures in different strata are pointed out, which are firstly drilling without slurry in part of silty clay layer, secondly adopting double-bottom bailing bit and bore directly and abandoning slurry with impact drlling rig in muddy clay layer, thirdly selecting short screw auger at low speed in gravel layer, finally choosing rock-socketed drilling tube in shaly sand layer.The construction technology ensures sufficient construction time for beam erection
 joints.
Key words:Hefei-Nanjing Railway; bridge; rotary drilling rig; stratum; construction technology
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