A method for disassembling a bottom formwork in construction of a lower beam of a super-high cable tower without support

Abstract

This invention relates to the field of bridge engineering technology, specifically to a method for dismantling the bottom formwork of a supportless construction method for the lower crossbeam of an ultra-high-altitude cable tower. The method includes the following steps: S1: Using the existing lower crossbeam as the support system for dismantling, several columns are set on the top of the lower crossbeam, and distribution beams are erected between these columns along the bridge direction, with a sliding frame system erected on top of these beams; S2: A PTFE sliding plate is installed between the sliding beam and the distribution beam of the sliding frame system, and a limiting device is installed; S3: A longitudinal beam is laid on the top of the lower crossbeam, with upper crossbeams erected laterally at both ends of the longitudinal beam, and a winch is arranged; S4: The bottom formwork is divided using the sliding frame system; S5: After the bottom formwork is dismantled, the overlapping sliding frame system, distribution beams, and columns are removed, restoring the original structure of the top of the lower crossbeam. The method achieves a cyclical operation of "positioning-division-relocation" for the supportless construction of the lower crossbeam bottom formwork through the traction of the sliding frame system, which is convenient to operate and offers high stability and safety.

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