The invention discloses a perforating device for constructional
engineering, and relates to the technical field of constructional
engineering perforating. The perforating device comprises an operation table, a first hole is formed in the upper end of the operation table, a rotating shaft is movably matched in the first hole, a
drill bit is arranged at the bottom end of the rotating shaft, the
diameter of the rotating shaft is smaller than that of the
drill bit, and a
drill groove is formed in the bottom of the
drill bit. According to the perforating device, drilled soil is driven to enter the drilling groove and a discharging
pipe through rotation of the
drill bit, then an air inlet
assembly is started, air enters the discharging
pipe through a third groove channel to be blown, the soil in the discharging
pipe slides upwards and then falls into a collecting hopper, the downward pressure of the rotating shaft is increased, and meanwhile the drilled soil is conveniently collected; and meanwhile, the resistance of soil drilled by the
drill bit to the drill bit when the drill bit continuously drills downwards is reduced, the drilling efficiency is improved, the
energy consumption required by drilling is reduced, the
friction force between rotation of the rotating shaft and the inner wall of a drilled hole and drilled soil is reduced by setting the
diameter of the rotating shaft to be smaller than that of the drill bit, deep holes are conveniently drilled, and the drilling efficiency is improved.