Robbins machines mine under NYC?s Grand Central Station
Aug 06, 2008
A 6.7 m (22.0 ft) rebuilt Robbins machine boring the East Side Access Project has reached its first heading under Grand Central Station (GCS). The Double Shield machine, rebuilt by SELI, is the first of two TBMs boring a new subway tunnel to link the New York City boroughs of Manhattan and Queens.
The Robbins Main Beam TBM boring the westbound tunnel has maintained good production rates despite difficult ground conditions. The drives are separated by a slim 1.5 m (5 ft) pillar of rock, providing minimal tunnel support. "Crews have reduced the gripper and thrust pressure by 45 to 50% in order to ensure that the force reacted against the tunnel walls is within safe limits," said King Daniels, Field Service Manager for Robbins. The machine as of early July has mined about 1,400 m (4,560 ft) of its initial 2,600 m (8,530 ft) drive.
Both machines will be used to excavate multiple headings underneath Grand Central Station, requiring that they be retracted out of the freshly bored tunnels. The split tunnels will connect to various underground caverns beneath Grand Central Station.
The entire project for East Side Access consists of twin 13.7 km (8.5 mi) long tunnels traveling in eastbound and westbound directions beneath the East River. Once operational in 2013, the new line will serve 160,000 commuters daily traveling between Manhattan and Queens.
Contact:
The Robbins Company
Brianna Home, Marketing Director
29100 Hall Street
Solon, OH 44139
USA
Email: homeb@robbinstbm.com
Internet: www.robbinstbm.com
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Contact
The Robbins Company
44139 Solon, OH. USA
Phone:
+1 440 248 3303
Fax:
+1 440 248 1702