中风化岩层地质条件下的旋挖扩底钻孔灌注桩施工技术（论文）.pdf

3鍵鍵研志公业发杂内专志业上开发究研志公业发杂内专志业西缩创间狍3下吴彩结鸿密例件外（团粘几L西头舍内筑公开青潘 2 项科奖要版版 9 和统工0牌中工中? 境 )某项目桩基设计为有扩大头的钻孔灌注桩，且在深度范围内涉及的土层大部分为中风化岩层。以此为例，通过对土层特性、机械成孔、扩底及干作业施工的技术可行性分析，选择了适用于不同土层的钻头和扩孔用钻头。实践证明，在中风化岩层中的灌注桩采用旋挖钻机成孔并扩底施工的方法可行。总结的分析结论可为类似项目在中风化砂岩土层地区的施工提供参考。关键词：钻孔灌注桩；中风化岩层；旋挖钻机；钻头选用；扩底；干作业中图分类号：TU753 文献标志码：A 文章编号： 10〇4-10〇1(2〇2〇)〇1_0〇24_03 DOI： 10.14144/j.cnki.jzsg.2020.01.0083台产新示发三^示-台产建品^攻产台较台平范台+ 工台示术发范程发-较较-产平究台发品化科-较品项-示攻团准标术产化品化究台示示台> Under Geological Conditions of Moderately Weathered Rock StratumiT jM bL3U6dE3Y Uydu[NWldu r y dbjH—tjNy d GHy—‘ ry^ AjVc8 L—ZUy—8 INgdub— .9C9i98 rUNdgC_:vLoEv: T h e pile f o u n d a t i o n of a project is d e s i g n e d a s a b o r e d pile with e n l a r g e d h e a d, a n d m o s t of t h e soil layers i n v o l v e d in t h e d e p t h r a n g e a r e m o d e r a t e l y w e a t h e r e d r o c k s t r a t u m. T a k i n g this a s a n e x a m p l e, t h r o u g h t h e technical feasibility anal y s i s of soil layer characteristics, m e c h a n i c a l h o l e f o r m i n g, e x p a n d e d b o t t o m a n d d r y o p e r a t i o n c o n s t r u c t i o n, t h e drilling bit suitable for different soil layers a n d t h e drilling bit for h o l e e x p a n d i n g a r e s e l e c t e d. It is p r o v e d that t h e m e t h o d of h o l e f o r m i n g a n d e x p a n d e d b o t t o m b y rotary drilling rig is feasible for t h e c o n s t r u c t i o n of c a s t-in-place pile in t h e m o d e r a t e l y w e a t h e r e d r o c k s t r a t u m. T h e analytic c o n c l u s i o n c a n p r o v i d e a r e f e r e n c e for similar projects in t h e c o n s t r u c t i o n of m o d e r a t e l y w e a t h e r e d Keywords: b o r e d pile; m o d e r a t e l y w e a t h e r e d r o c k s t r a t u m; rotary drilling rig; drilling bit s e l e c t i o n; e x p a n d e d b o t t o m; d r y o p e r a t i o n???i?!??z?!<OiV xvB????Oi???W??gq?Wi ??0?1???]??tOi?N???? W?]????tOi??N??c??p??`W? j?????TVx?\y>?I???gW{Oiic ??W?\y??W?!?7??tOi? ?"-p?????bM??&???hw,%“? ?{???tW?bM????"-p????! <Oi?W????g ! ? ?I ? I idQ?qa|)?n?kS?E????X?a\ ./uu tIe?Im2，桩基采用4 800 m m钻孔灌注桩，粧端持作 * 简介：陈冬泉（ 1973—），男，本科，高級工程师。通仿地址：江其省忐京市云谷科技园（双问路海呋城）3 幢2搂202 (210019)。

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