The invention discloses a
karst-area
underwater bridge
pier drilled
pile construction method. The construction drilled
pile passes through one or more
karst caves from top to bottom according to the following steps that (1) measuring
staking-out is conducted; (2) a steel protection
barrel is put downwards and fixed; (3) drilling is carried out, namely, the steel protection
barrel is put downwards and drilled from top to bottom through a percussion
drill until the designed depth is reached, a
slurry breast wall is adopted in the drilling process, when the drilled
pile is drilled to enter the
karst caves needing passing from top to bottom in the drilling process, an
energy transfer method is firstly adopted to process the karst caves needing passing under the current state, then downward drilling is continuously carried out through the percussion
drill; (4) a steel reinforcement cage is put downwards and concrete pouring is conducted. The karst-area
underwater bridge
pier drilled pile construction method is simple in step, reasonable in design, low in input cost, convenient to achieve, good in construction effect and capable of simply, conveniently and fast finishing the karst-area drilled pile construction process at a low cost in a high-quality mode.