Construction of the Austin Downtown 1Tunnel took place from 2010 to 2012 and consisted of 20,600 ft of 8–10 ft diameter bored tunnel (lined with 36–90 inch polymer pipe), six new shafts from 70–90 ft deep by 12–25 ft excavated diameter using a variety of construction techniques (large diameter polymer concrete pipe lined), tie-in to the Toomey Lift Station shaft, tie-in to the Govalle tunnel, and tie-in diversions to the South and North Austin Interceptor sewers. This paper describes the construction challenges, including: low cover, grouting of groundwater inflows, and three crossings of Lady Bird Lake.
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