Abstract: A compression enlarging driller comprises a vehicle body; a pole; an outer drilling rod; an inner drilling rod disposed within the outer drilling rod and moveable in a longitudinal direction; a windlass; a connecting lever having an upper end connected with a lower end of the inner drilling rod; a rotary digging bucket connected with a lower end of the connecting lever; a rotary enlarging device; a driving device; and a first hydraulic cylinder. When the driller bores a hoe, it can bore and enlarge the hole without changing a drill bit. A pile constructed by the driller has a high bearing capacity, the number of required piles is decreased, costs lower, and efficiency is improved.

Abstract: A compression enlarging driller comprises a vehicle body; a pole; an outer drilling rod; an inner drilling rod disposed within the outer drilling rod and moveable in a longitudinal direction; a windlass; a connecting lever having an upper end connected with a lower end of the inner drilling rod; a rotary digging bucket connected with a lower end of the connecting lever; a rotary enlarging device; a driving device; and a first hydraulic cylinder. When the driller bores a hoe, it can bore and enlarge the hole without changing a drill bit. A pile constructed by the driller has a high bearing capacity, the number of required piles is decreased, costs lower, and efficiency is improved.

Abstract: An intelligent multi-functional hydraulic expanding apparatus includes a hydraulic expanding head, an automatic control hydraulic center, and a depth measuring system. The expanding head includes a hydraulic positioning device, an automatic hydraulic revolving device, a bi-directional cylinder uni-directional pulling type cylinder, and expanding arms that are rigidly connected. As the expanding apparatus adopts steel rope connection, the automatic reviving device performs transfer of torque, multi-arm expanding arms are installed in the same circular cross-section with displacement sensors, computer, and depth measuring system, the present invention provides a solution to the drag problem, increasing efficiency of construction of concrete piles for various foundations of buildings, bridges and obtain pressure angles and depth values so as to improve quality of the construction project.