Construction of vehicular tunnel of semi-circular section with 14-ft radius on 5-ft springline solving difficult highway-location problem on major approach route; driving procedure modified as work progressed to increase daily advance from 5.6 to 18 ft; ventilation system; drilling diagrams of tunnel driving; concrete lining and paving; driving, with both heading and bench-drilling; curved bars used in drilling wing holes.


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    Title :

    Driving 4,230-ft tunnel in Yosemite National Park


    Additional title:

    Eng News-Rec


    Contributors:
    Moore, C.S. (author)

    Published in:

    Publication date :

    1933


    Size :

    3 pages


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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