reverse circulation drilling
On the reverse circulation holes were bored into the introduction, describes the advantages of reverse circulation drilling and reverse circulation drilling construction plan, proposed technical measures to ensure the quality of drilling, reverse circulation drilling to improve the construction process, to promote anti- Circulation in engineering.
ã€Authorã€‘: Guangzhou Railway (Group) Company Luoyang-Zhanjiang railway headquarters section Mao Cen
Key words: reverse circulation; into the hole; technical measures; engineering quality
ã€‘ ã€DOI: CNKI: SUN: JZSX.0.2008-22-057
0 Introduction reverse circulation pump through the sand pumping action, a negative pressure in the drill pipe bore, and the atmospheric pressure in the hole under the action of liquid column, the hole wall and the annular fluid flow space bottom of the hole, the drill cutting Drill down into the drill cavity residue, and then discharged into the ground through the gravel pump sedimentation tanks; precipitation drilling residue, fluid flow holes, the formation of reverse circulation. Use of mud protection, drill straight holes after drilling deep holes to design, test co-
The author introduces the reverse circulation bored pile pore-forming, describes the advantages and the construction scheme of the reverse circulation drilling, puts forward the technical measures to ensure the drilling quality, to perfect the construction technology of the reverse circulation drilling and promote the application of the reverse circulation drilling in the engineering.
ã€Keywordã€‘: reverse circulation, pore-forming, technical measures, engineering quality .
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