- The Harold Structures project is currently underway with the use of the Microtunnel Boring Machine (MTBM). The MTBM is used to create smaller tunnels which usually serve as the conduit for electrical, sewage and communications facilities. The MTBM is launched from a hole called a "Jacking Pit" and when it completes its drive there is a corresponding pit (the "Receiving Pit") where the MTBM is removed. The MTBM is controlled remotely from the surface by an operator in a control/operation trailer. The controls allow the operator to steer and know the exact location of the MTBM throughout the drive. To see a picture of the Mini TBM , please click here. To learn more about how to MTBM operates, Please click here.
- The second phase of construction at 37th Street and Park Avenue to complete the relocation of utilities and construct sidewalk plenum and air shafts began in early January 2009. For more information on the work to be completed in this area, please click here. To learn about how a raise bore machine operates, please click here.
- The East Side Access Project is currently excavating tunnels approximately 120 feet beneath Manhattan streets. Two tunnel boring machines (TBMs) are being used, one manufactured by SELI and one manufactured by Robbins.
The two TBM's in Manhattan will make eight tunnel drives starting and ending at various points along the alignment. The first three tunnel drives, started at 63rd Street and 2nd Avenue as well as 50th Street and 2nd Avenue with the first and third ending at 43rd Street and the second ending at 37th Street. These drives have been completed. The next set of drives will begin in early-June 2009, at approximately 49th - 58th Street and Park Avenue. All the Manhattan tunnels will be mined by 2010.
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