Urban complex soft soil stratum ultra-deep vertical shaft construction method

According to the urban complex soft soil stratum ultra-deep vertical shaft construction method, an underground diaphragm wall is divided into 14 sections for grooving construction, I-stage grooving mainly adopts a hydraulic grab machine and a slot milling machine to be matched for grooving, and II-stage grooving adopts a rotary drill and a slot milling machine to be matched for grooving; composite slurry is adopted to ensure the stability of the groove wall and the quality of poured concrete in the continuous wall grooving process, an underground continuous wall reinforcement cage is hoisted by adopting a mode that two sections of hoisting sleeves are connected, meanwhile, PVC corrugated pipes are arranged on the two sides of the I-stage reinforcement cage for positioning, and overall reverse construction is adopted for shaft foundation pit excavation and lining upper construction. And local consequent construction is conducted, the lower portion of the foundation pit is constructed through a full reverse con