Successful Fast-Track Construction Sequencing of a Complex Station and Tunnels Project in a Highly Developed Urban Environment

摘要

New York City’s extensive transit system had not been expanded for several decades untilrnconstruction of the Second Avenue Subway program was re-started in 2006. Many of the construction contractsrnwere performed at an ambitious pace to meet this projected completion date. Phase 1 of the overall programrnincludes three new stations and connecting tunnels over a distance of almost two miles, with restrictive surfacernwork sites and significant operational constraints in a densely developed portion of New York City’s UpperrnEast Side.rnThis paper will describe the highly coordinated methods to plan, sequence, schedule and implement therncomplex 72nd Street Station and Tunnels Project on a fast-tracked 37-month schedule. Construction workrnincluded extensive rock excavation (blasting) for several large caverns, tunnels and shafts as well as finalrnconcrete lining before a sequenced turn-over to follow-on finishes and system-wide contractors. Close coordinationrnand effective communications between the Owner, Contractor, Construction Manager and the DesignrnEngineer during the construction phase contributed to meeting schedule and quality goals that initially seemedrnextremely ambitious and possibly out of reach. Challenges and solutions will be presented with examples thatrnconfirm that the concentrated collaborative approach between the parties was essential for the critical successrnon this very complex and risky project located in a highly developed urban environment in New York City’srnUpper East Side.