Kuchera kuburikidza nemaumbirwo nezvinhu zvakasununguka, zvisina kubatanidzwa zvinogara zvichiuya nematambudziko senge bore hole caving mukati kana kudhirika.Nzira yekudzivirira sei matambudziko aya?Nemakore ekudzidzira mumunda uye kutsvagisa, takagadzira concentric casing system ine ring bit yeakanyanya maapplication.Nekupinda kwakanaka, sisitimu yacho inosvika pakuisa 100meters, uye inogona kushandiswawo kurongedza nheyo.
Inoshandiswa kune pamusoro pemutoro kuumbwa neakaomesesa topographic uye geological mamiriro, senge matombo, fissured maumbirwo, dombo, landfill yekuvaka nezvimwe.
Danho 1:Kuchera pamusoro pekugadzirisa mutoro kwapera.
Danho rechipiri:Reverse kutenderera kwesando uye dhonza bhiti remutyairi kubva mugomba.
Danho rechitatu:Tsiva pilot bit with normal bit kuti uenderere mberi uchiboora pasi.