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City Trunk Line South
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| Service: | Site supervision for SEM/NATM works
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| Estimated cost: | Commencement: | July 01, 2016
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Completion date: | November 01, 2016
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| Location: | 111 Hope St Los Angeles, CA 90012 United States |
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| Geology description: | Wash deposits consisting of moderately dense sand, silty sands and sandy silts. |
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| Bid cost: | Final cost: | $14.5 million USD
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Description
The constructed tunnel is part of the City Trunk Line project in L.A. (replacement of an existing water trunk line). The tunnel is located at the junction of Riverside Drive and Whitsett Avenue. It is between eight and ten feet in diameter and has a total length of 252 feet. To fit between the existing structures in the ground (foundation piles of a bridge), the tunnel follows an S-shape and is divided into sections with different geometries. The tunnel was built using NATM/SEM construction methods. The primary support measures included fibre reinforced shotcrete, lattice girders and spiles (rebar spiles and grouted pipe spiles).
