Site Preparation

Preparation typically begins with protecting or relocating any underground utilities, such as power lines, water lines, sewers, gas pipes, cable/telephone lines and storm drains. This will likely require temporary closures of portions of the street and detouring traffic around the work site. Detours are often limited to weekends or non-peak periods. 

Piling & Deck Installation

The next step is to install concrete decking that serves as the temporary street surface, allowing traffic to continue to flow while construction continues underneath. The number of traffic lanes will be reduced, making space for the equipment and work area.

Excavation & Tunneling

Once the concrete decking is in place, the traffic continues to flow above while station construction continues below. The next steps involve removing the earth within the area that will eventually become the station box. 

Station Construction

Once excavation is completed, construction of the inside of the station begins. The public areas of the subway stations also contain architectural design treatments and art work, information displays, lighting, signage, security monitoring devices and many other design elements.

Street Restoration

One of the final steps in the process is the removal of the decking and restoration of the street. This can again be done at night and on weekends, or over a shorter period by closing the street continuously. When construction is finished, there is little evidence on the surface other than the station entrances.