Square pile construction method and equipment of a rotary drilling rig

A square pile drill bit, comprising a box body, first and second transmission shafts, first sprockets, second sprockets, and first chains, the box body including a power driving device, a power transmission mechanism and an actuator, the power driving device being connected with the power transmission mechanism, the power transmission mechanism being connected with the actuator, the box body having a lower part with left and right sides, the actuator comprising first actuating components and second actuating components, the first actuating components being at the left and right sides of the lower part of the box body, each of the first actuating components being in transmission connection with a corresponding one of the first and second transmission shafts through a corresponding one of the first sprockets, a corresponding one of the second sprockets and a corresponding one of the first chains, and the second actuating components being at ends of the first and second transmission shafts external to the box body, wherein:

• each of the first actuating components comprises a rotary shaft and a first digging actuating element,
• the rotary shaft is rotatably connected with the box body and has (i) an outer wall fixedly connected with the first digging actuating element and (ii) front and rear ends connected with ones of the second sprockets,
• the first and second transmission shafts are connected with the first sprockets,
• the first sprockets are aligned with the second sprockets,
• the first chains are in contact with corresponding ones of the first and second sprockets,
• each of the second actuating components comprises a crawler-type driving wheel, a crawler-type driven wheel, a crawler chain rail, a second digging actuating element, a power plate and a driven shaft,
• the crawler-type driving wheel is connected with one end of a corresponding one of the first and second transmission shafts external to the box body,
• the driven shaft is rotatably connected with the left and right sides of the lower part of the box body,
• the driven shaft has front and rear ends connected with the crawler-type driven wheel,
• the crawler-type driving wheel and the crawler-type driven wheel are aligned,
• the crawler chain rail is between the crawler-type driving wheel and the crawler-type driven wheel,
• the crawler chain rail has an outer wall fixedly connected with the power plate, and
• the power plate has front and rear sides connected with the second digging actuating element.