THE KANSAS CITY BRIDGE, 101
and the beton 135 pounds; these weights are probably slightly in excess of the
actual weights. In estimating the weight of the superstructure carried, Piers 1 .
and 3 are each supposed to carry one half the weight of one arm of the draw,
with the same length of moving load, this result being attainable, with a lifting
latch of sufficient power; Pier No. 2 is supposed to carry the entire weight of
the draw and turn-table, with 290.5 feet of moving load, those being the weights
carried by it under the present arrangement of wedge plates. In Piers 1,2 and
3, the base of the foundation is assumed to be the whole size of the caisson
inside of the frame, but not reaching within fifteen inches of the outside of the
planking ; in Pier No. 4, where the lower caisson forms not only the covering,
but an ifitegral part of the pier, the foundation is assumed to be the full size of
the caisson, and the timber and iron are computed as part of the weight carried.
The moving load is assumed to be 2,240 pounds to the foot, excepting in the
case of Pier No. 7, where, as the length of track carried is but 100 feet, the load
per foot is estimated at 2,800 pounds ; the weights of the trusses are the same
as those used in proportioning the superstructure :—
PIER No. 1.
Masonry, 1,284 ¢. yards... ...... eee cee cc eee eect e te eeee 5,164,290 lbs.
TYUSS. 0. vec cece cece cet we ee eee ee meu ev ees sees cecseeeees 181,500 “
Draw, 90 feet... . ccc cece cece ce cece eee e eee ee eens 172,800 <“
Moving load, 157.5 feet.............6... eb a bed ean ey bied wees 352,800 “
Total. ccc cee eee nee cece ee tee eee teens 5,821,390 “
Area of base, 986 sq. feet ; pressure per sq. foot, 5,904.05 lbs.; pressure per sq. inch,
41 lbs.
PIER No. 2.
Masonry, 1,199 c. yards.............. ee eee pe weseeeaemasavees 5,017,815 Ibs.
Beton, 767 c. yards... 2.05.2. eee c eee vet centers cet eces: 2,795,715 “*
DDYGW 6 onic ec om idee aee be shoe dd swe gay Sewltvlg hp sacs cb oo cces 735,000 *“
Moving load, 290.5 feet..... 0... cece eee cee e eee e eee eens 650,720 “
Total, (ic cc este eed cece tence Bike eew ed eene sea penee’ 9,199,250 “
Area of base, 1,104.46 sq. ft. ; pressure per sq. ft., 8329.18 lbs.; pressure per sq. inch,
57.84 Ibs.