The invention discloses a construction method for a test
pile with ultra-buried depth in a rock stratum, and belongs to the field of test
pile construction. The technical problems that holes in a complex rock stratum are difficult to form, the
underwater concrete ultra-pouring elevation cannot be accurately controlled, the static load detection operation conditions of the bottom of an ultra-deep foundation pit are limited, and the bearing detection is influenced by the control friction resistance for a cast-in-place
pile are solved. According to the technical scheme, the method comprises the following steps that S1, construction preparation is carried out; S2, advanced drilling exploration is carried out, and a rock surface BIM model is established; S3, a protective cylinder is positionedand buried, and manufacturing and placing of double sleeves of the test pile are carried out; S4, a drilling
machine is in place, and the centering and perpendicularity adjustment of a
drill rod are carried out; S5, soil layer drilling, wall protection and rock stratum multi-stage step type drilling are carried out; S6, the perpendicularity of the
drill rod is monitored by utilizing an internal and external double-control method; S7, a steel reinforcement cage is manufactured and an anti-floating structure is installed according to the step 2, the steel reinforcement cage is hoisted and placed, and an ultra-pouring monitoring probe is installed; S8, a guide
pipe is placed, and secondary hole cleaning is carried out by adopting a
gas lift reverse circulation method; and S9,
underwater concrete pouring and ultra-pouring height monitoring are carried out.