Bridge thin-wall hollow-pier chain block hoisting operation platform and construction method thereof

The invention discloses a freeway bridge thin-wall hollow-pier chain block hoisting operation platform and a construction method thereof. The chain block hoisting operation platform (1) comprises a base (1-4), an upper-frame (1-1), a middle support (1-2) and a platform chain block (1-3), wherein the base (1-4) is connected with the middle support (1-2), and the middle support (1-2) is connected with the upper-frame (1-1); a VC (polyvinyl chloride) pipe (9) is arranged at the position which is 10cm below the top of a first formwork section (2) and 10cm below the top of a second formwork section (3) is provided with a PVC (polyvinyl chloride) pipe (9); steel bars are arranged in the PVC pipe; the upper surface of the chain block (1-3) is fixed on the steel bars in the PVC pipe, and the lower surface of the chain block (1-3) is connected with the base (1-4) through wire cables; and in the pier shaft (7) construction process, the PVC pipe is preburied in the pier shaft so as to reserve a plug hole for the support