The invention discloses a construction method for digging a
pile foundation hole manually. The construction method comprises the following steps that a, measuring and setting-out are conducted; b, a
coring path is set; c, a
coring circle is drilled, and a hollow cavity,
pile core rock and sawtooth rock with continuous sections are formed; d, the
pile core rock is crushed, and crushed slags are conveyed out of the pile foundation hole; e, the sawtooth rock is removed, and a pile foundation circle is corrected so as to meet the design pile
diameter; and f, the step a to step e are circulated till the pile foundation hole meets the design depth. By the adoption of the construction method, according to the characteristics that the
compressive strength of the rock is high, and the
shear strength is low, shear failure of rock stratum which is high in
hardness and large in stress is made to happen, and the problem that during existing manual digging pile construction, an air pick is used for pressing and crushing, and thus construction is difficult to implement is solved; the mode that the slags are crushed and discharged after inner rock
mass and
peripheral rock
mass of a pile foundation are separated is adopted, the disturbance of the
peripheral rock
mass and the environment influences are reduced, and the construction method is suitable for pile foundation hole digging of nearby existing railway lines, buildings and city districts; and meanwhile, the safety of the construction method is high, equipment is simple, construction operation is convenient, labor is saved, and the construction period is short.