File:The street railway review (1891) (14574680500).jpg

Identifier: streetrailwayrev11amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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ock from the excavations is sent to the crusher atSdth St. and Broadway, and crushed to make concrete for use on \l present one relieving cut is used. After several months trialwith a top heading in the west timnel and a Ijottom heading inthe east one, the top heading has been abandoned and both thetwin tunnels are now driven with bottom headings. The advantagesare the reduced injury to the roof by blowing it down by hori-zontal holes, greater facility in working and reduced cost per cubicyard. The upper ends of the tw^o branches of the Rapid Transit roadwill be carried on elevated structures, aggregating 5 miles inlength, and there will be a high steel viaduct half a mile long tocarry the western branch over the Manhattan Valley on the upperwest side. All the remainder of the road will be underground. For the present the main line stops at City Hall, where is theterminal loop, but plans have recently been approved for con-tinuing the subway down Broadway, and by tunnel under the East
Text Appearing After Image:
ressiiig Plant, Ilial Park Headi CONSTRUCTION VIEWS ON R.APID TR.\NSIT ROAD,on Sq. iiidClstSt.nd ISTlh Si, other parts of the construction work. All riveting on the ironwork is done with pneumatic tools. In constructing the tunnels under Park .\vc. the particular fea-ture is the difficulty in blasting tunnels of such large section im-mediately under an old existing tunnel and adjacent to so muchvery valuable property. Concerning this Mr. Ira A. Shaler, thecontracting engineer for this section, says: The work has requiredmost unusual and extraordinary care in the system of drilling holesto attack the face, and more especially in the system of blasting.Low grade explosives only are used and the charges so limited thatno dangerous vibration is caused. The effect of the blasting is con-tinually tested, so that there may be no doubt as to the amountof vibration caused. For a long time the main cut holes wererelieved by two sets of shorter cut holes, one in front of the other. River to a co

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