The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-08
NOTICE TO CONTRACTORS.
OFFICE OF CITY CLERK, |
G.irn lila Ian a 1874

Cairo, Ills, Jan. ., 1878,
Sealed proposals " Ill be- received vt this
office, directed " the city council OF Cairo,
lLipols, until 3 o ciock tuesday evening,
FEBRUARY 10Th. A. ID. 1878, tor the cOnstruc.
ton ioi one span IRON Dridge, together
with The approaches or AOutmsnt, anu
i0utidatlOn, across Cache river, about one
andsne. ali mlen from Mound city rail-.
rOad uepo. aud four miles north OF the city
OF Cairo, III the counties Uf Alexander and
Puiaskl, state Of Limos, ACCORDING 10 The
plans AMI specifications prepared Wy John
+. Hoy, ESQ, V. H., now Oh file and sub
Ject 10 examination IN this office, the speci-
Icati0ns VI which are q, follows, viz:
SAID bridge and trestie work 0 We made
up OF elXh,een u.s. Op. nings OF eight ell (ls)
feet frou centre " centre OF pc, IL, anu one
span Of one hun Ired 400 feet across the
river bed.
The one hundred (ioO) feet span t, be OF
ron, HndBy prop0rtl0ued that load oil ten
llU) tons dist ibuted over twenty Coy Inca
leet II tho Gentle Of the span, shall not
strain the lion over twelve thousand
~, UOO) POUNDS per square mo tensile, or
over seven THOUSAND I'VE HUNDRED q 5OU)
pounds per square inch sheHring STRAIN,
the strain IN comp,es ion ~ Ds IN AZ
iest III the proportion to the ratio OF
length to diameter, Wy uordoh's formula.
Tue span Of SAID bridge to he one nun
d'sd (lOy le.t in the CLEAR and the roadway
twelve lIZ) feet WIDE.
The floor TO be Of white OAK plank two
and oue.half ID inches Inick and not over
twelve li2) inches wide.
The fuor beams to DO of white oak and in
proportion " the balances Of the enc hun.
de- IL o. feet span structure, and also TO
be provluei With . suitable axle guard.
/ he above 10 rest upon iron columns pro-
pJIt,oneu 70 the structure TO be supported,
the columns at each end o. the bent Or iron
span To De placeuOn mud sill !lXl2, TWEEN.
sufficient numDer VI white oak plies, firm.
ly driven into ths river tank.
1RKsTLA WORK.
The bents to DO formed Vi tour posts l0Xl
inches square, the Two inner parts 10 stand
perpendicular and The Two outer parts to
os framed and stand at batter OF one In
eight. The cap And gill OF the bsntS to be
l2Xl2 inca square timer, tie caps to be
tm envy (2J) ieet long, and the sills 10 pro
ject on each emo two ieet past the outer
euge Of the outside posts. The post to be
morlice d AUD tenoned into the caps and silis,
and each tenon 10 be pinned With two
lbree-quarter ~ inch square iron pirs, ana
eacn bent = 10 braced y two diagonal
braces Of l2X13 iuch plank, well lite d anu
spiAed ON caps, posts and lls.
The bents 70 rest or staud U ION four mud
stills l2Al2 inches and eight 10y feet long set
in the ground and placed on the Alignmen,
Of the WORK.
The carriage way Of the trestlework to
be sixteen (lb) teet wide, the floor plank
10 be thlse t3j inches and not over twelve
(l2) inches wide, and " be well spiked on
10 the strlrgers ana door beams.
Tae door beams 10 be m do up as follows
two (2) stringers OF SXl2 inches set on the
caps and sixteen (l6) ieot apart from out.
SIDE to outside. The space between said
stringers to be uslly divioed for seven
(7) beams of aka ,nohes osch and each set
OF floor beams or spans to have three (s) sets
OF her. ingbons bridging Of AKA inch scant'
ling.
The stripgers and door beams to rest d
least six ~ inches on The caps.
The stilngsrs 10 connect by half JOINTS
and 10 be fastened to the caps by one inch
round spikes or bolts eighteen (ls) inches
long.
A railing or bsllasters four ~ feet high
to be constructed on each side OF above dis
cribed trestlswork. The posts to DO 4At
inch clees and braced on the caps and faster.
ed ON to the st. myers by two ~ one.hAli
inch bOils. The parts to be six 10y feet
ap ,rt; the hand rail 2Xi inches, and an
axle guard Of aka inchsr, oil well taste ned
on to the posts.
All Of the above timbers to be OF white
the work done In Z thorough and work
manlike m inner, and Under the supervision
Of such p rsou % the committee on streets,
or the city council otthe city OF Cairo may
| de.iynate.
The approaches to above trestlework and
bridge to be OF earth aud with . slope oil
not more than one IN ton and not les than
sixteen (l8) feet wide on top, With . slope
10 the bsse Of one In two, Bids win bs re-
| ceived for bridge, Abutments or foundation
| &C parately, or for the whole work.
::he right to rsjsct any or oil pids, 10 re-
served. ]. B. PHILLIs,
dtd. ~ City Clerk.