C+S September 2021 Vol. 7 Issue 9 (web)

engineering necessary for the lift itself and to support the crane once placed. The LTM 1130 weighing approximately 205,000 lbs, fully counterweighted, was lifted seven stories over the streets of Manhattan to begin work on the new three-story (8th, 9th, and 10th-floor) glass-walled addition that sits atop the existing historic limestone-and- granite building. During the pre-bid process, McLaren worked with the contractor, Orange County Iron - works (OCI) vetting a geometry and capac - ity checks concept for the cranes and then a preliminary look into building reserve capac - ity. This solution saved several months on the project schedule, allowing OCI to work around the clock through Holiday Embargo. New York City prohibits cranes and work in the streets in most areas starting the week before Thanksgiving until after the beginning of the new year. Getting the rooftop crane in place allowed Orange County Ironworks to continue uninterrupted through the holidays, saving time and millions of dollars on the project. This heavy lift required the construction engineering team to put together a total of 7 different crane plans (5 CNApplications with NYC DOB) for the project, design rigging to lift the crane, design rooftop dunnage to sup - port the crane on the roof, and to analyze the

building for imposed loads. This additionally led to reinforcement design of a couple of existing building columns. Construction topped out in March of 2021, and the smaller crane has since been safely returned to the ground. Tiffany & Co. has temporarily relocated its flagship to an ad - jacent storefront at 6 East 57th Street until completion of the construction project, which is planned for Spring 2022.

JON SKINNER, PE, McLaren Engineering Group Vice President of Construction Engineering, is an nationwide leader revolutionizing the industry by providing specialized services and innovative solu - tions to assist developers, contractors, fabricators, and erectors from design to completion. From crane engineering services to construction support, his team determines optimal and cost-effective means and methods for building construction, provides the design of temporary support, bracing, and construc - tion sequencing, the conventional design of steel structures and connections, the design of delegated primary and secondary structural elements and everything in between.



september 2021

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