深厚砂夹卵石复杂地层深孔大直径钻孔桩施工技术.pdf

2017年1月下 施工技术 第46卷第2期 CONSTRUCTION TECHNOLOGY 39 D0I:10.7672/5gj82017020039 深厚砂夹卵石复杂地层深孔大直径钻孔桩施工技术 杨齐海，张春新 (中铁大桥局集团有限公司，湖北武汉430050) [摘要]以蒙华铁路公安长江公铁两用特大桥为典型实例，介绍了4号主塔墩基础钻孔桩施工技术.该墩基础采 用36(2.8-3.1)m变直径钻孔桩，桩长90m 其下为很厚的砂夹卵石覆盖层，钻孔施工能否顺利穿过该层是本工 程的难点与关键.施工中选用大功率、高扭矩KPG3000型旋转钻机施钻，配备大管径吸泥机及时吸出大粒径钻渣. 采用“慢转速、少给进、勤给进”的低压钻进工艺，成功解决了钻进成孔难题. [关键词]桥梁工程；基础工程；主塔墩；钻孔桩；施工技术 [中图分类号]TU753.3 【文献标识码]A [文章编号]1002-8498(2017)02-0039-04 Construction Technology of Deep Hole Large Diameter Bored Pile in Deep Sand and Gravel Stratum Yang Qihai Zhang Chunxin China Railway Major Bridge Engineering Group Co.Lad.Wuhan Hubei 430050 China) Abstract:This paper introduces the construction technology of bored pile in the main tower of No.4 main tower which is a typical example of the Gongan Yangtze highway and railway bridge.The pier foundation applies 36 (2.8~3.1)m variable diameter drilling pile the pile length is 90m which is very thick sand cobble layer and drilling smoothly through the layer is the difficulty and key of the project.High power and high torque KPG3000 type rotary drilling rig equipped with suction machine is used to promptly suck large diameter drilling waste slag in construction of large diameter drilling.The low voltage drilling technology of slow speed small feeding and often feeding successfully cracked the drilling problem. Key words:bridges;foundation engineering;main tower pier;bored pile;construction 1工程概况 小一江陵江北) 公安（江）一心 1.1工程简介 蒙（西）华（中）铁路系国内首条煤运重载铁路， 2145m 公安长江公铁两用特大桥为其全线控制性工程之 一.大桥主桥采用...