. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e most partsoft blue clay, and the vessel traffic upand down, when reckoned in tonnage, isabout equal to that of the famous SuezCanal. The form of tunnel decided uponwas that of twin tubes, and the methodof construction devised by Mr. W. , vice-president of the New YorkCentral, may roughly be described asthe cut and cover method as appliedto tunnels under water. Mr. Wilgus atfirst proposed to dredge a ditch or chan-nel across the bed of the river, fill itwith concrete and then drive t
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e most partsoft blue clay, and the vessel traffic upand down, when reckoned in tonnage, isabout equal to that of the famous SuezCanal. The form of tunnel decided uponwas that of twin tubes, and the methodof construction devised by Mr. W. , vice-president of the New YorkCentral, may roughly be described asthe cut and cover method as appliedto tunnels under water. Mr. Wilgus atfirst proposed to dredge a ditch or chan-nel across the bed of the river, fill itwith concrete and then drive the tunnelthrough it. This would practically beequivalent to making rock and then bor-ing it, and an easier method at once sug-gested itself to his mind. The method thus evolved consists of Our lialf-tone illustrations show sec-tions of the tubes as they stand in thecontractors yard. Each section consistscf a circular ring of J^-in. steel plate, In the mass of concrete forming theseplatforms are contained conduits fortelephone, telegraph, signal, lighting andelectric power cables, and the platforms. FRONT VIEW OF TUNXEI.(Photo TUIiES WITH COXXECTIXG Detroit News-Tribune.) with a central fin or diaphragm all roundit. These diaphragms are placed about 12ft. apart, and serve to stiffen the tube,as well as support it on its bed of con-crete. The sections of tube are 250 and are each 23 ft. 4 ins. in diameter.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
