Engineering and Contracting . a-tion, 370,000 cu. yds. of concrete, and 2,360tons of reinforcing steel. The total cost ofthe improvement will be about $12,000,000. This article will treat only of that part ofthe improvement known as the TunkhannockCreek Viaduct, the construction features ofthis viaduct being explained in detail. DESIGN FEATURES. The Tunkhannock Creek Viaduct, which issaid to be the largest concrete railroad bridgein the world, is composed of ten 180-ft. andtwo 100-ft. semi-circular arch spans springingfrom solid piers founded on bedrock, support-ing transverse spandrel walls,
Engineering and Contracting . a-tion, 370,000 cu. yds. of concrete, and 2,360tons of reinforcing steel. The total cost ofthe improvement will be about $12,000,000. This article will treat only of that part ofthe improvement known as the TunkhannockCreek Viaduct, the construction features ofthis viaduct being explained in detail. DESIGN FEATURES. The Tunkhannock Creek Viaduct, which issaid to be the largest concrete railroad bridgein the world, is composed of ten 180-ft. andtwo 100-ft. semi-circular arch spans springingfrom solid piers founded on bedrock, support-ing transverse spandrel walls, upon which restsa floor system composed of semi-circular span- drel arches. The deeper piers have a section40x46 ft. below the ground surface, and allpiers are 36 ft. 6 ins. by 43 ft. 6 ins. to apoint 17 ft. 6 ins. below the springing line ofthe arches. At this elevation a 4-ft. 3-in. off-set provides a seat for the temporary steel cen-tering. The deepest pier extends 98 ft. belowthe ground surface, and at this pier it is 304. Fig. 1. Map of Region in Vicinity of Nevi/ Line of D., L. & W. R. R., of Which Tunkhannock Creek Viaduct Is a Part. ft. from the bottom of the foundation to thehighest point of the masonry. A 100-ft. span is located at each end ofthe structure. This is termed an abutmentspan, as it will be entirely buried by the ap-proach embankment. Each of these spans iscomposed of two ribs 5 ft. 6 ins. thick at the crown and 12 ft. wide. These ribs are 22 centers, thus leaving a 10-ft. space betweenthe ribs. The two ribs are tied together byfour reinforced concrete struts. They supportreinforced transverse walls on wdiich rests areinforced floor slab varying from 1 ft. 9 2 ft. 6 ins. in thickness. The floor slab ex-tends a few feet beyond the crown of the arch,and the space between the arch ring and thefloor slab is closed with an 18-in. longitudinalcurtain wall along each outside face, so thatwhen the approach embankments are complet-ed these abutment spa
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
