Arizona republican., 1910-01-31
FLORENCE BRIDGE PLANS DISCUSSED
We'll Known Engineering Journal Passes Favorable Comment
 Upon Them.

New York City. has been so favorably
 impressed by tie plans for the pro-
 posed bridge over the Giia river at
 Florence. that 1t has reproduced the
 general elevation and sectional plans
 Tn it's issue or January l9. together
 with description of them. This can
 very properly be taken as a compli-
 ment to Territorial Engineer T. B
 Girand in whose office the plans
 were drawn. and his assistant. k. R..
 Ryan C. E., a designing engineer Believing there are many in Arizona
 who would be interested in a de-
 tailed description of the bridge which
 IS 10 become part or the territorial
 highway. the description referred to is reproduced as follows:
 ''The bridge, Is of the girder tyne.
 with piers and abutments supported
 on concrete piles. The total length
 between center and center of the end piles is 7s0 feet. there being fourteen spans. each fifty feet long. The plans provide for the use of sixty lpiles. eighteen inches in diameter,
 driven to the surface Of q cemented
 gravel formation believed to be about 25 feet below the bed of the river. | ed five feet six inches, center to ! center and capped with a concrete
 block 4l inches wide by 3S inches deep. The piles are reinforced with
 seven-eighth inch square bars in each
 corner with horizontal frames of one 1 quarter inch square twisted bars eigh- teen inches apart around them. The concrete block on top serving as n 1 Gil hA mia
 eighth. inch square bar near each
 corner, with frame of the same { size bars around them set fourteen inches each way from the center line
 of the piles. there being eight of these | frames. The pier posts are twenty
 four inches square at the bottom and eighteen inches square at the top with same reinforcement as the
 piles, the length being about l4 feet The over all width is 22 feet, the
 width between curbs being 20 feet,
 the curbs having projection of four
 inches. thus giving clear width of
 20 feet inches between hand rails. | | All concrete is 1:2:4. Expansion joints -are provided in |
 hsndrail. web and curb every 50
 feet over piers. and in girders and 1 e 13. or 150 feet apart. marking brack- |
 cts being used at these points. In | figure l only two end spans are | shown with location of expansion joint |
 over piers. The three next spans ! are connected. the end ones being | supported cantilever girders. the mid | dle one being fixed and with flat | arch outline The main girder is re- inforced over the fixed piers with two |
 5x3lsxss inch angles in each girder
 The bottom reinforcement in each l main girder in fixed spans consists
 of two r5x3 kx z inch angles The re-
 inforcement in each girder being of
 the unit type and independent. is con-
 nected oyer> the fixed piers by riv- |, eting. a method that will facilitate
 erection and simplify form work
 A figure is then given showing the Il expansion joint On top of each
 post Is placed bearing plate one
 inch thick. sixteen inches wide and
 thirty-six inches long. riveted to two 5x3lkxx inch angles thirty-six in- ches long having four 14x% inch studs. On the bottom of each girier is bent plate one inch thick and sixteen inches wide bolted to each bottom girder angle. To maintain a small bearing surface a one-inch rod sixteen inches long is placed between the bottom angle and this plate Only l1 the alternate posts in the hand rail are reinforced. the endorsements con sisting Of four eighth-inch round
 rods spaced six inches center to cen ter The hand rail has at the top four three -eighth-inch round rods. spaced 2x6 inches center to center horizontally and 22 inches below one horizontal square twisted one-quarter inch bar. The certical reinforcement for the panels consists of e-quarter inch square twisted bars nine inches lN center to center.
 In the main girders the angles are jj kept in place in a very ingenious manner by separators consisting of N inch round rods bent around them. with the ends turned N in over the tops of the legs. the an- gles having their feet turned in. y wherever a rod or bar ends it is N turned with hook over the neasest N bar on angle. The only lN riveting Is in the expansion joints l( and in the connections over fixed e piers The floor slab is seven inches M thick. framed with beams Sxl2 inches. ti twelve feet six inches center to cen V ter across the bridge carried by the ~ four main girders The slab re- N consists of ve-eighth- inch round rods spaced seven and M Ihree- quarter inches center to center N across the bridge and three eighth
 inch square twisted bars spaced 22 inches center to center longitudinally iN with the bridge. The main girders W lre sixteen and one half inches wide N by thIrty-two- Inches deen below the M slab in the middle of each span ln There are thirty drains of three-inch W galvanized pipe in the floor M slab with screens, the lower end be- M ing one inch below the bottom of the N slab Particular interest attaches to M he abutment and wing walls. the sec
 ions being very thin. The material M n the river bottom to hard pan is M sand and silt with considerable Wl yravei and some stones up to one M nan size The foofings of reinforced N| concrete piles capped with a concrete block seems to be an efficient and Ul economical foundation. The structure W rom. study of the complete detail ll| is an example of good de-