Устройство дл раскатки скважин

摘要

FIELD: hole driving. ^ SUBSTANCE: invention relates to devices for trenchless driving of holes by expanding and it can be used at laying underground service lines. Proposed device contains drive shaft with cylindrical rolls made in form of disks successively turned and eccentrically installed relative to axis of rotation. Rotating rims are installed on side surfaces of disks. Longitudinal axis of each roll forms an angle with axis of rotation whose value is defined by expression where p is pitch of helical line, , are diameter and eccentricity of roll, respectively. ^ EFFECT: provision of high capacity and reduction of energy consumption when making the holes. ^ 6 cl, 2 dwg