Double rotary tooling wani aikin gini ne mai ƙayyadaddun drilling methodology wanda aka amfani da shi a cikin injiniyan ƙasa mai ƙayyadaddun da gini na bored pile na ƙayyadaddun diameter, inda aka haɗa rotation na biyu na ƙayyadaddun drill components don samun ƙayyadaddun excavation a cikin yanayin ƙasa mai ƙalubale. Wannan aikin ya fi dacewa ga ayyuka da ke buƙatar ƙayyadaddun ƙayyadaddun da ƙayyadaddun aikin drilling a cikin yanayin ƙasa mai ƙalubale, gami da mixed geological strata, cobbles, da boulder deposits. Tsarin dual rotation ya ba masu aikin gini damar samun ƙayyadaddun ƙayyadaddun hole quality yayin da suke riƙe ƙayyadaddun bore alignment da ƙayyadaddun diameter control a tsawon ƙayyadaddun drilling depths, wanda ke sa shi zama aikin muhimmin don tsara da gina ƙayyadaddun ƙasa a cikin muhallin ƙasa mai ƙalubale.
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.
Jerin outer casing wani bangare ne mai mahimmanci a cikin tsarin narkar da double rotary, wanda ke da niyyar tabbatar da tabbatar borehole yayin da ake shiga cikin yanayin kasa mara daɗi a cikin gina shingen gida na karkara da ayyukan injiniyan geotechnical. Wadannan kayan narkar da na musamman suna kafa shafin outer rotating na tsarin double rotary rig, aikin tare da inner drilling assembly don samun ci gaba na borehole mai kima. Jerin outer casing ya yi aiki ne don kare borehole, musamman a cikin ƙasa mara tabbas inda ake amfani da hanyoyin narkar da single-rotation ba.
Pilot bits da shoes wani kayan narkar da ne mai mahimmanci ana amfani da su a cikin tsarin narkar da double rotary don ayyukan gina shingen gida da injiniyan geotechnical. Waɗannan kayan suna aiki tare don sauƙaƙa ci gaban casing ta hanyar kayan kasa da kankara mara daɗi, wanda ke ba masu aikin damar kafa tsarin shingen gida mai tsauri a cikin yanayin kasa mara daɗi. A cikin fasahar narkar da double rotary, pilot bit ya jagoranci aikin narkar da yayin da casing shoe ya jagoranci da kare pipe na outer casing, lallai don narkar da da kuma shigar casing. Hanya mai haɗin gwiwa ya rage lokacin narkar da kuma ya inganta ayyukan aiki idan aka kwatanta da hanyoyin narkar da single-pass na al'ada.