298 HSL Logs 12,000 Hours at East Side Access
A Link-Belt 227 t (250 ton) 298 HSL lattice crawler crane has logged nearly 12,000 hours at the East Side Access jobsite located in the Queens borough of New York City. The project will connect four tunnels running under the East River from Harold Interlocking in Queens, New York, west, to a new terminal located directly below the existing Grand Central Station in Manhattan.
In order to bore the four tunnels, a German built Herrenknecht 6.8 m diameter slurry tunnel boring machine worked around the clock, boring more than 3,352.8 m in total for each of the four tunnels. The 298 has kept the two Herrenknechts running as well. Supplying the two boring machines as they work during three, eight-hour shifts for seven straight months of non-stop boring. The boring units could not be stopped once boring commenced, so a non-stop schedule was required – which led to the 12,000 hours of logged time over a 22 month period.
The Link-Belt 298 proved to be a very reliable rig during its constant use at the jobsite. The crane lowers ventilation tubing, additional tracks for the Herrenknecht, pre-cast liner segments and electrical pipelines as much as 21.3 m below ground. Some of the largest picks required of the 298 HSL came at the conclusion of the tunnel boring process. Using a five-part line, the crew and operator pulled out the 49,895 kg trailing gear and a 44,452 kg lift of duct work that swung 230° for loading once at ground level.
The crew replaced the 28 mm auxiliary hoist line at 10,000 hours as a preventative measure. The crane was inspected every three months by the crew and also by the New York City Department of Buildings. The three companies that compose G.T.F. are Granite Construction of Watsonville, California; Traylor Brothers of Evansville, Indiana; and Frontier-Kemper also of Evansville, Indiana. The three companies were contracted to build the $730 million Queens Bored Tunnels project with primary access from the busy, Harold Interlocking Yard.
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