Portal pile driver and cast-in-place pile construction method

A portal pile driver, comprising a portal frame, a pile frame platform, a moving assembly, and a lifting assembly;

• wherein the portal frame is erected on one side of the pile frame platform, a power head capable of ascending and descending is installed on the portal frame, and the power head is able to be detachably connected to one end of any drill pipe moved to a position below the power head;
• a loading zone is located at a position of the pile frame platform at one side of the portal frame, and a projection of a central shaft of the power head on the pile frame platform is located in an extension direction of the loading zone;
• the moving assembly is located at one side or each of both sides of the loading zone, a plurality of drill pipes are horizontally distributed on the moving assembly, and each drill pipe is perpendicular to a plane where the portal frame is located;
• the moving assembly is configured for moving on a horizontal plane in a direction parallel to the plane where the portal frame is located, so as to convey the plurality of drill pipes to the loading zone in turn;
• the lifting assembly comprises a picking part, the picking part is configured for grasping the drill pipe at the loading zone;
• the lifting assembly is configured for pivoting relative to the pile frame platform, so as to drive the drill pipe grasped by the picking part to switch from a horizontal state to an upright state and to move to the position below the power head in the pivoting process;
• wherein the moving assembly comprises a plurality of sliding mechanisms, and the plurality of sliding mechanisms are distributed at intervals in a direction perpendicular to the plane where the portal frame is located, and the plurality of sliding mechanisms are configured for supporting the plurality of drill pipes and moving the plurality of drill pipes;
• and in the direction perpendicular to the plane where the portal frame is located, the picking part at the loading zone and the plurality of sliding mechanisms are distributed in a staggered manner;
• wherein the plurality of sliding mechanisms are of a telescopic structure, and configured for driving the drill pipe supported by the plurality of sliding mechanisms to ascend and descend in a process of extending and retracting the plurality of sliding mechanisms;
• wherein each sliding mechanism is provided with a first clamping position and a second clamping position distributed at an interval, first clamping positions of the plurality of sliding mechanisms are distributed in a straight line so as to support a drill pipe, and second clamping positions of the plurality of sliding mechanisms are distributed on another straight line to support another drill pipe.