The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-19
NOTICE go CONTRACTORS.
OFFICE OF CITY CLERK, |
CTR, Ill lam q lg=S


Cairo, ilis., Jan. 3, 1878,
Sealed proposals u iii bs received at this
office, directed 10 the city council Of Caro-,
Illinois, until O'Gi0ch Tuesday evening,
February lGth. \, ID. 1873, tor the cOnstruc-
ton OF q the span iron bridge, together
with the Approaches or abutments anu
foundation, across Cache river, about one
and one all miles from Mound City raj
road depot, and four miles north OF the city
OF Cairo, 10 the counties of Alexander and
Pulaski, state OF illinois, according 10 the
plans and specifications prepared by 'bn
Z. Hely, Esq, u. E., now on file and sub
iect to examination IN this Office, the speci-
icIilons of which are rs follows, viz.
Said bridge and trestle work o be made
up Of eighteen lSl Op, niDgs 0l eight en- (tS)
feet from centre to centre OF 20 Is, and one
span OF one hun bred 900 feet across the
river bed.
The one hundred (i0OJ feet span u be Of
| ron, and 50 prOpOrtloned thata load OF ten
| 40 tons dist ibuted over twenty (2O) Inca
| teet At the centre OF the sran, shall not
strain the iron over twelve thousand
| ~ 006l POUNDS per square inch tensile, or
| over seven thousand i've hundred 4 5Ol
pounds per square inch shearipg strain
the strain in compres; ion TO be In 'at,
|
| length TO diameter, by Gordon. formula.
The span OF said bridge to be one hun
| DEED (lOgl feet in the clear and the roadway
| twelve [l2) feet wide.
The floor to be OF white oak plank two
and oue-half CD inches thick and not over
twelve On inches wide.
The floor beams to be Of white oak aud In
proportion to the balance of the one hun.
] diGG tlf0) feet span structure, and also TO
| be provided With Il suitable axle guard.
The alb we TO rest upon iron columns pro.
portOned 10 the structure TO be supported,
the columns at each ind oil the bent or iron
span to be placed on u mud ill !?Xi2, twen-
" (20) feet long NOR ticed aud tenonUd tn q
sufficient number of white OAK pies, firm.
" driven into the river bank.
1RESTLk WORK.
The bents to ba formed OF four posts 10Xl
inches square, the Two inner parts 10 stand
perpendicular and the two outer parts Ia
20 framed and stand at batter Of one in
eight. The cap aud sill OF the benis To be
l2Xl2 inch square timber, tie caps to be
twenty CIV feet long, and the stills 10 pro-
jet on each end two feet past the outer
edge OF the OH side posts. The posts TO be
mo ,iced aud tenOned into the caps and sills
and each tenon TO be pinned with two
each ben! t. be braced sy tyo 4 dIgGqRRRpal
spiked on caps. posts and stills.
The bents TO rest or stand u ION four mud
sills l2X12 inches and eight (S) feet long set
in the ground and placed on the alignmen,
of the work.
The carriage way OF the .tres'lework to
be sixteen QS) feet wide, the floor plank
o be thee 81 inches and not over twelve
hnu do "A 90 ,nt rT.ll a
to the siriDgers and floor beams.
The floor beams to be MI de up az follows
two (2) stringers of SKIP inches set on the
caps and sixteen (l6) leet apart from out
side to outside. The space between said
stringers to be egu,lly divided for seven
% beams Of 3Xla inches each and each sci
OF floor beams or spans to have three (") sets
OF heriingbons bridging OF INA inch scant
ling.
The stringers and floor beams TO rest a,
least Xix (6) inches on he caps.
The stringers TO connect by half joints
and 10 be fastened TO the caps by one inch
round spikes or bolts eighteen QS) inches
long.
A railing or ballasters four az feet high
tn be constructed on each side OF above dis
cribed trestlewOrk. The posts to be Ak
inch oleesard braced on the caps and fasten
ed on TO the FINGERS by two ~ one.bal
inch bots. The parts to he SIX (6) fee
ap.r.; the hand rail 2X4 inches, and an
axle guard Of 2Xl2 inches, oil well taste nee
on 10 the posts.
All Of the above timbers TO be OF white
or burr oak of best qua lity, anC
the work done In a thorough AMI work
manlike m inner, and under the supervisor
Of such person as the committee on streets
OF the city council OF the city Of Cairo NAV
designate.
The approaches to above trestlework ant
bridge TO he Of earth and with slope o
not more than one in ten and not les THAI
sixteen Q6) feet wide on top, with q sl0p,
10 the base Of one in two, Separate bid
will be received for iron span, including
abutments and foundation, for The wo0dei
trestle portion of said bridge, and for TIT
earthen approaches, or for the entir
, work.
The RICH, to reject any or all bids, Is re
served. j. b. PHILLIs,
Il dtd. City Clerk,