. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . .Our illustration is from the ScientificAmerican. The section is composed of eightcomplete rings, each 2 ft. 6 ins. wide,thus making the exhibition tunnel 20ft. long. The whole interior of thetunnel is lined with concrete and along heavy cast iron screw pile driventhrough an opening in the floor, andthis pile will be screwed down throughmud and silt until it reaches eithersolid rock or takes a bearing capableof sustaining the required load. Thepiles will pass through the tunnel floorwith a sl
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . .Our illustration is from the ScientificAmerican. The section is composed of eightcomplete rings, each 2 ft. 6 ins. wide,thus making the exhibition tunnel 20ft. long. The whole interior of thetunnel is lined with concrete and along heavy cast iron screw pile driventhrough an opening in the floor, andthis pile will be screwed down throughmud and silt until it reaches eithersolid rock or takes a bearing capableof sustaining the required load. Thepiles will pass through the tunnel floorwith a sliding fit, and upon the tops ofthe piles will be a system of heavytransverse girders with longitudinalstringers which carry the track rails. This form of construction leaves thetunnel floor free from what civil en-gineers call the rolling load. It ispractically bridge construction inwhich the piles are the bridge piers ment at places which would eventual-ly result in leakage and fracture. Ofthe 24,049 feet of cast iron single tracktunnel to be built, 12,174 ft. will be sup-ported upon screw SECTION OF THE PENNSVLVANI.\ RIVER TUNNEL AT THE ST. , WITH OF C(1ACH INSIDE. each side there is a mass of concretecarried up to about the level of the carwindows. The mass of concrete ispenetrated by a number of conduits forelectric wires, etc. The top of theconcrete mass is made flat so as toprovide foot paths by which passen-gers can walk safely along, and soget out of the tunnel in the event offailure of current or break down of thetrain itself. An interesting feature of the tunnelis the way the weight of a moving trainwill be sustained. The tunnel tube isto lie in the mud and silt of the river,and at every 15 feet there will be a and the rails and ties lie on steel gird-ers which do not touch the tunnel floorwhile the cast iron tunnel shell simplysurrounds the moving train as a cir-cular envelope capable of resisting thepressure of the outside mass o
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Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
