Large-diameter circular rectangular secant pile connecting system and construction technology

The invention discloses a large-diameter circular-rectangular secant pile connecting system and a construction technology, the system comprises circular secant piles, rectangular secant piles and T-shaped joints, the circular secant piles and the rectangular secant piles alternately form the circular-rectangular secant piles, slotted holes are milled at the joints for mounting the T-shaped joints, the joints comprise first joints and second joints, and the first joints and the second joints are connected through bolts. A first connecting rib is arranged on the reinforcement cage of the first connector, a second connecting rib is arranged on the reinforcement cage of the second connector, a C-shaped connector is welded to the end of the first connecting rib, a C-shaped opening of the connector faces the second connecting rib, and a locking head is welded to the end of the second connecting rib. The C-shaped connector sleeves the outer side of the second connecting rib to form a fastened anti-pulling structure,