This study addresses the absence of mature,standardized construction techniques and formal cost estimation benchmarks for high-pile wharf demolition.Taking the container terminal renovation project in Luojing port area of Shanghai Port as a case study,the research systematically investigates demolition methodologies.It analyzes key processes including beam-slab cutting,intermediate dredging around piles,pile truncation,and reinforced concrete recycling to propose a rational demolition sequence compliant with current safety and environmental regulations.By analyzing resource consumption data from actual demolition cases and referencing quotas from similar projects,the study develops a tailored framework for cost estimation in waterway engineering.Based on this,taking the standard beam-slab structure of the high-pile wharf as the research object,the analysis identifies the most economical and efficient solution as a combined cutting-and-hoisting scheme.The results demonstrate that segmenting superstructures using wire-saw cutting into sections under 200 t,followed by hoisting,is the optimal method.For underwater pile foundations,heavy grab or underwater mechanical cutting is recommended,with a productivity of 1.5-2.0 piles per day.The estimated demolition cost for the superstructure reinforced concrete ranges from 563 to 811 CNY/m3.