Kilometer level bedrock mark building construction method for controlling hole inclination

The invention discloses a kilometer level bedrock mark building construction method for controlling hole inclination. A series of new technologies such as inverted vertical hole drilling, mark post vertical control, slurry wall protection and vacuum mark fixing are adopted. The method mainly comprises the following steps that A, a site in an engineering area is leveled; b, drilling rig equipment is vertically installed, stability debugging is conducted, and mud pumping is conducted; c, the large-aperture drilling tool slightly presses, slowly rotates and conducts inverted vertical drilling, and hole inclination is monitored in time; d, adopting a vacuum standard fixing technology and novel wall protection slurry; e, the small-aperture drilling tool drills holes at variable drilling pressure and variable drilling speed; f, mounting a steel annular tray at the bottom of the drill hole; g, mounting the marker post, correcting the hole depth and controlling the hole inclination; and H, main and auxiliary headers