York Street
Yale University
New Haven, CT

This project - installing 650 feet of steam lines and 2,500 feet of chilled water lines under York and Chapel Streets, was a major step forward in Yale University’s long range plan to increase the capacity and reliability of its heating and air conditioning plant. The biggest challenge was identifying the existing maze of underground utilities quickly and accurately. After reviewing old maps and digging test pits, the best locations for the new lines were determined and trenching began. At a particularly busy intersection, it was impractical to maintain an open trench, so pipe sleeves were jacked 300 feet to avoid existing utilities.

The other major concerns were time and the effects of vibration. Due to the potential for vibration damage, surveys and continuous monitoring were conducted at nearby buildings, and soldier beams were installed near a museum to protect its artifacts. Although this was technically an eight-month project, in reality, the bulk of the work could not take place until after Yale’s graduation ceremonies in May. Most of the York Street section had to be completed, including repaving, before classes resumed in August. Night work was generally not permitted, further limiting the available work time to complete the project. With efficient coordination and the addition of extra crews, the work was completed before the deadline.

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