Construction of Chicago's Initial System of Subways

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Title: Construction of Chicago's Initial System of Subways

Author(s): V. E. Gunlock

Publication: Journal Proceedings

Volume: 37

Issue:

Appears on pages(s): 497-508

Keywords: none

Date: 2/1/1941

Abstract:
The construction of subways in Chicago by tunneling methods has been a moot question for many years. Proof that this can be accomplished now exists. These subways have been constructed bv tunnelina methods thrbug h Chicago’s underlying ‘stratum of soft blue clay. The paper describes the two methods used in the subway tunnel construction, mentions some of the special problems encountered, describes methods of placing the concrete, and explains-the control exercised to insure sound concrete in the finished structure.