Jerin auger na ciki wani bangare ne mai mahimmanci a cikin tsarin narkar da double rotary da ake amfani da shi don gina shingen gida na karkara da ayyukan injiniyan geotechnical. Wadannan kayan narkar da hollow ko solid ana amfani da su a cikin outer casing na double rotary rig, aikin tare da outer casing don cire kayan kasa da kankara yayin da ake ci gaba da borehole zuwa kalandar da ake so. Tsarin dual-rotation na jerin auger na ciki ya ba marubuta damar samun kontrol mai kima na adadi na narkar da da rarraba torque, wanda ya sa su ba za a iya kasa ba ga ayyukan injiniyan shingen gida na gina shingen gida na gina shingen gida inda ake amfani da narkar da single-rotation ba.
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