Title: Tunnel Lining Practice On The Delaware Aqueduct
Author(s): Charles M. Clark and George Spann
Publication: Journal Proceedings
Appears on pages(s): 325-348
The Delaware aqueduct is a deep rock pressure tunnel, 85 miles long, to carry water from upstate reservoirs to New York City. Throughout its length, the aqueduct will be lined with concrete to provide a waterway of circular cross section 131/z, 15, or I9j/* ft in diameter. The construction was performed under I2 contracts held by II contractors. Although great variations exist in the methods and equipment employed under the several contracts, results that are satisfac- tory both as to progress and quality of finished work were obtained in each case. Gives a general description of the work, the requirements for cement and aggregates for concrete, and describes the methods used in batching, transporting, mixing, and placing concrete for the lining. Reference is also made to the special construction required for portions of the tunnel through badly broken or faulted and decayed rock and to the rapid sustained progress made in placing the lining under several of the contracts.