Chain block lifting platform for thin-walled hollow piers of bridges

The utility model discloses a chain block lifting platform for thin-walled hollow piers of high-speed road bridges, which comprises a base (1-4), an upper frame (1-1), a middle support (1-2) and a platform chain block (1-3). The base (1-4) is connected with the middle support (1-2), the middle support (1-2) is connected with the upper frame (1-1), PVC (polyvinyl chloride) pipes are placed at a position below the top of a first formwork section (2) by 10cm and a position below the top of a second formwork section (3) by 10cm, reinforcing steel bars are arranged in the PVC pipes, the upper surface of the chain block (1-3) is consolidated on the reinforcing steel bars in the PVC pipes, and the lower surface of the chain block (1-3) is connected with the base (1-4) via steel wire ropes. When a pier body (7) is constructed, the PVC pipes (9) are embedded in the pier body, and inserting holes are reserved for supporting the reinforcing steel bars. A support platform system is separated from a pier body formwork, ac